diff --git a/hscript.hxml b/hscript.hxml
index e9f3c44..3c99746 100644
--- a/hscript.hxml
+++ b/hscript.hxml
@@ -1,2 +1,3 @@
 bin/build-each.hxml
+-D hscriptPos
 -hl bin/Test.hl
\ No newline at end of file
diff --git a/hscript/CustomClassHandler.hx b/hscript/CustomClassHandler.hx
index 10b399c..cb8f59a 100644
--- a/hscript/CustomClassHandler.hx
+++ b/hscript/CustomClassHandler.hx
@@ -155,6 +155,7 @@ class CustomClassHandler implements IHScriptCustomConstructor {
 
 class CustomTemplateClass implements IHScriptCustomClassBehaviour implements IHScriptCustomAccessBehaviour {
 	public var __interp:Interp;
+	public var __customClass:hscript.customclass.CustomClass;
 	public var __allowSetGet:Bool = true;
 	public var __custom__variables:Map<String, Dynamic>;
 	public var __real_fields:Array<String>;
diff --git a/hscript/IHScriptCustomClassBehaviour.hx b/hscript/IHScriptCustomClassBehaviour.hx
index 11d24fd..e51b19d 100644
--- a/hscript/IHScriptCustomClassBehaviour.hx
+++ b/hscript/IHScriptCustomClassBehaviour.hx
@@ -2,6 +2,7 @@ package hscript;
 
 interface IHScriptCustomClassBehaviour {
 	public var __interp:Interp;
+	public var __customClass:hscript.customclass.CustomClass;
 	public var __custom__variables:Map<String, Dynamic>;
 	public var __allowSetGet:Bool;
 	public var __real_fields:Array<String>;
diff --git a/hscript/Interp.hx b/hscript/Interp.hx
index e0ff26d..87af3c8 100644
--- a/hscript/Interp.hx
+++ b/hscript/Interp.hx
@@ -28,6 +28,8 @@
  */
 package hscript;
 
+import hscript.customclass.CustomClassDecl;
+import hscript.customclass.CustomClass;
 import haxe.CallStack;
 import hscript.utils.UnsafeReflect;
 import haxe.PosInfos;
@@ -65,8 +67,30 @@ class RedeclaredVar {
 	public var depth:Int;
 }
 
+@:access(hscript.customclass.CustomClass)
+@:access(hscript.customclass.CustomClassDecl)
 @:analyzer(optimize, local_dce, fusion, user_var_fusion)
 class Interp {
+	private static var _customClasses:Map<String, CustomClassDecl> = new Map<String, CustomClassDecl>();
+
+	public static function getCustomClass(name:String) {
+		return _customClasses.get(name);
+	}
+
+	public static function customClassExist(name:String):Bool {
+		return _customClasses.exists(name);
+	}
+
+	private static function registerCustomClass(c:CustomClassDecl) {
+		#if CUSTOM_CLASSES
+		var name = c.classDecl.name;
+		if (c.pkg != null) {
+			name = c.pkg.join(".") + "." + name;
+		}
+		_customClasses.set(name, c);
+		#end
+	}
+
 	public var scriptObject(default, set):Dynamic;
 	private var _hasScriptObject(default, null):Bool = false;
 	private var _scriptObjectType(default, null):ScriptObjectType = SNull;
@@ -137,11 +161,21 @@ class Interp {
 	var curExpr:Expr;
 	#end
 
-	public function new() {
+	var _proxy(default, null):Null<CustomClass> = null;
+	var _nextCallObject(default, null):Dynamic = null;
+	var _inCustomClass(get, never):Bool;
+
+	private function get__inCustomClass():Bool {
+		return _proxy != null;
+	}
+
+	public function new(?proxy:CustomClass) {
 		locals = new Map();
 		declared = [];
 		resetVariables();
 		initOps();
+		
+		this._proxy = proxy;
 	}
 
 	private function resetVariables():Void {
@@ -232,6 +266,12 @@ class Interp {
 	}
 
 	public function setVar(name:String, v:Dynamic):Void {
+		if (_inCustomClass && _proxy.superClass != null) {
+			if (_proxy.superHasField(name)) {
+				Reflect.setProperty(_proxy.superClass, name, v);
+			}
+		}
+
 		if (allowStaticVariables && staticVariables.exists(name))
 			staticVariables.set(name, v);
 		else if (allowPublicVariables && publicVariables.exists(name))
@@ -244,6 +284,28 @@ class Interp {
 		var v = expr(e2);
 		switch (Tools.expr(e1)) {
 			case EIdent(id):
+				// Make sure setting superclass/static fields directly works.
+				// Also ensures property functions are accounted for.
+				if (_inCustomClass) {
+					if (_proxy.__class.hasField(id)) {
+						var v = expr(e2);
+						_proxy.__class.hset(id, v);
+						return v;
+					} else if (_proxy.superClass != null && _proxy.superHasField(id)) {
+						var v = expr(e2);
+						Reflect.setProperty(_proxy.superClass, id, v);
+						return v;
+					} else if (_proxy.hasVar(id)) {
+						var v = expr(e2);
+						_proxy.hset(id, v);
+						return v;
+					} else if (_proxy.superClass == null && _proxy.__class.classDecl.extend != null) {
+						// Caches the declaration to set it once superClass is created
+						var v = expr(e2);
+						_proxy.cacheSuperField(id, v);
+						return v;
+					}
+				}
 				var l = locals.get(id);
 				if (l == null) {
 					if (_hasScriptObject && !varExists(id)) {
@@ -300,6 +362,33 @@ class Interp {
 				}
 				// TODO
 			case EField(e, f, s):
+				if(_inCustomClass) {
+					switch (Tools.expr(e)) {
+						case EIdent(id0):
+							if (id0 == "this") {
+								if (_proxy.hasField(f)) {
+									var v = expr(e2);
+									_proxy.hset(f, v);
+									return v;
+								}
+								if (_proxy.superClass != null) {
+									if (_proxy.superHasField(f)) {
+										var v = expr(e2);
+										Reflect.setProperty(_proxy.superClass, f, v);
+										return v;
+									}
+								}
+								else if(_proxy.superClass == null && _proxy.__class.classDecl.extend != null){
+									// Caches the declaration to set it once superClass is created
+									var v = expr(e2);
+									_proxy.cacheSuperField(f, v);
+									return v;
+								}
+							}
+						default:
+							// Do nothing
+					}
+				}
 				var obj = expr(e);
 				if(s && obj == null) return null;
 				v = set(obj, f, v);
@@ -556,6 +645,20 @@ class Interp {
 			return null;
 		id = StringTools.trim(id);
 
+		// Custom Class
+		if (_inCustomClass) {
+			_nextCallObject = null;
+			if (id == "super") {
+				if (_proxy.superClass == null) {
+					return _proxy.superConstructor;
+				} else {
+					return _proxy.superClass;
+				}
+			} 
+			else if (id == "this") 
+				return _proxy;
+		}
+
 		if (locals.exists(id)) {
 			var l = locals.get(id);
 			if(l != null)
@@ -571,6 +674,35 @@ class Interp {
 		if(customClasses.exists(id))
 			return customClasses.get(id);
 
+		if(customClassExist(id))
+			return getCustomClass(id);
+
+		// Custom Class
+		if (_inCustomClass) {
+			// We are calling a LOCAL function from the same module.
+			if (_proxy.__class.hasField(id)) {
+				// Static access
+				return _proxy.__class.hget(id);
+			}
+			if (_proxy.hasFunction(id)) {
+				_nextCallObject = _proxy;
+				return _proxy.resolveField(id);
+			}
+			else if (_proxy.superHasField(id)) {
+				_nextCallObject = _proxy.superClass;
+				return Reflect.getProperty(_proxy.superClass, id);
+			} else {
+				try {
+					var r = _proxy.resolveField(id);
+					_nextCallObject = _proxy;
+					return r;
+				} catch (e:Dynamic) {
+					if(doException)
+						error(EUnknownVariable(id));
+				}
+			}
+		}
+
 		if (_hasScriptObject) {
 			// search in object
 			if (id == "this") {
@@ -639,7 +771,7 @@ class Interp {
 		var e = e.e;
 		#end
 		switch (e) {
-			case EClass(name, fields, extend, interfaces):
+			case EClass(name, fields, extend, interfaces): //Not sure if leave the old system or implement the new one.
 				if (customClasses.exists(name))
 					error(EAlreadyExistingClass(name));
 
@@ -779,7 +911,21 @@ class Interp {
 						error(EInvalidOp(op));
 				}
 			case ECall(e, params):
-				var args:Array<Dynamic> = [for(p in params) expr(p)];
+				var args:Array<Dynamic> = []; // [for (p in params) expr(p)];
+				for (p in params) {
+					switch (Tools.expr(p)) {
+						case EIdent(id):
+							var ident = resolve(id);
+							if (ident is CustomClass) {
+								var customClass:CustomClass = cast ident; // Pass the underlying superclass if exist
+								args.push(customClass.superClass != null ? customClass.superClass : customClass);
+							} else {
+								args.push(ident);
+							}
+						default:
+							args.push(expr(p));
+					}
+				}
 
 				switch (Tools.expr(e)) {
 					case EField(e, f, s):
@@ -1195,6 +1341,13 @@ class Interp {
 		if (o == null)
 			error(EInvalidAccess(f));
 
+		if (o is CustomClass) { 
+			if (cast(o, CustomClass).__class.hasField(f)) {
+				var clsName:String = cast(o, CustomClass).className;
+				error(ECustom('The field ${clsName}.${f} should be accessed in a static way.'));
+			}
+		}
+
 		var cls = Type.getClass(o);
 		if (useRedirects && {
 			var cl:Null<String> = getClassType(o, cls);
@@ -1246,6 +1399,13 @@ class Interp {
 		if (o == null)
 			error(EInvalidAccess(f));
 
+		if (o is CustomClass) { 
+			if (cast(o, CustomClass).__class.hasField(f)) {
+				var clsName:String = cast(o, CustomClass).className;
+				error(ECustom('The field ${clsName}.${f} should be accessed in a static way.'));
+			}
+		}
+
 		if (useRedirects && {
 			var cl:Null<String> = getClassType(o);
 			cl != null && setRedirects.exists(cl) && (_setRedirect = setRedirects[cl]) != null;
@@ -1288,20 +1448,140 @@ class Interp {
 	}
 
 	function fcall(o:Dynamic, f:String, args:Array<Dynamic>):Dynamic {
+		// Custom logic to handle super calls to prevent infinite recursion
+		if(_inCustomClass) {
+			// Force call super function.
+			if(o == _proxy.superClass)
+				return call(o, Reflect.field(_proxy.superClass, '_HX_SUPER__${f}'), args);
+		}
+		else if (o is CustomClass) {
+			_nextCallObject = null;
+			var proxy:CustomClass = cast o;
+			return proxy.callFunction(f, args);
+		}
+		else if (o is CustomClassDecl) {
+			// Static function call
+			var staticClass:CustomClassDecl = cast o;
+			if(staticClass.hasFunction(f))
+				return staticClass.callFunction(f, args);
+		}
+		
 		if(_hasScriptObject && o == CustomClassHandler.staticHandler) {
 			return UnsafeReflect.callMethodUnsafe(scriptObject, UnsafeReflect.field(scriptObject, "_HX_SUPER__" + f), args);
 		}
-		return call(o, get(o, f), args);
+
+		var func = get(o, f);
+
+		// Workaround for an HTML5-specific issue.
+		// https://github.com/HaxeFoundation/haxe/issues/11298
+		#if js
+		if (func == null && f == "contains") {
+			func = get(o, "includes");
+		}
+		#end
+
+		return call(o, func, args);
 	}
 
 	function call(o:Dynamic, f:Dynamic, args:Array<Dynamic>):Dynamic {
 		if(f == CustomClassHandler.staticHandler) {
 			return null;
 		}
+
+		if (_inCustomClass) {
+			if (o == null && _nextCallObject != null) {
+				o = _nextCallObject;
+			}
+			if (f == null) {
+				error(EInvalidAccess(f));
+			}
+			if (o == _proxy) {
+				// If we are calling this.fn(), special handling is needed to prevent the local scope from being destroyed.
+				// By checking `o == _proxy`, we handle BOTH fn() and this.fn().
+				// super.fn() is exempt since it is not scripted.
+				return callThis(f, args);
+			}
+			try {
+				var r = Reflect.callMethod(o, f, args);
+				_nextCallObject = null;
+				return r;
+			} catch (e) {
+				error(ECustom('Script threw an exception: \n${f}'));
+				_nextCallObject = null;
+				return null;
+			}
+		}
+
 		return UnsafeReflect.callMethodSafe(o, f, args);
 	}
 
+	/**
+	 * Call a given function on the current proxy with the given arguments.
+	 * Ensures that the local scope is not destroyed.
+	 * @param fun The function to call.
+	 * @param args The arguments to apply to that function.
+	 * @return The result of the function call.
+	 */
+	function callThis(fun:Dynamic, args:Array<Dynamic>):Dynamic {
+		// If we are calling this.fn(), special handling is needed to prevent the local scope from being destroyed.
+		// Store the local scope.
+		var capturedLocals = this.duplicate(locals);
+		var capturedDeclared = this.declared;
+		var capturedDepth = this.depth;
+
+		this.depth++;
+
+		// Call the function.
+		try {
+			var result = Reflect.callMethod(_proxy, fun, args);
+
+			// Restore the local scope.
+			this.locals = capturedLocals;
+			this.declared = capturedDeclared;
+			this.depth = capturedDepth;
+
+			return result;
+		} catch (e) {
+			error(ECustom('Script threw an exception: \n${fun}'));
+
+			// Restore the local scope.
+			this.locals = capturedLocals;
+			this.declared = capturedDeclared;
+			this.depth = capturedDepth;
+
+			return null;
+		}
+	}
+
 	function cnew(cl:String, args:Array<Dynamic>):Dynamic {
+		// Custom Class
+		if (customClassExist(cl)) {
+			var proxy:CustomClass = new CustomClass(getCustomClass(cl), args, null, this);
+			return proxy;
+		}
+		if (_inCustomClass) {
+			if (_proxy.__class.pkg != null) {
+				var packagedClass = _proxy.__class.pkg.join(".") + "." + cl;
+				if (customClassExist(packagedClass)) {
+					var proxy:CustomClass = new CustomClass(getCustomClass(cl), args, null, this);
+					return proxy;
+				}
+			}
+
+			if (_proxy.__class.imports != null && _proxy.__class.imports.exists(cl)) {
+				var importedClass = _proxy.__class.imports.get(cl).fullPath;
+				if (customClassExist(importedClass)) {
+					var proxy:CustomClass = new CustomClass(getCustomClass(cl), args, null, this);
+					return proxy;
+				}
+
+				var c = Type.resolveClass(importedClass);
+				if (c != null) {
+					return Type.createInstance(c, args);
+				}
+			}
+		}
+
 		var c:Dynamic = resolve(cl);
 		if (c == null)
 			c = Type.resolveClass(cl);
@@ -1312,4 +1592,58 @@ class Interp {
 			return Type.createInstance(c, args);
 		}
 	}
+
+	public function registerModule(module:Array<ModuleDecl>) {
+		var pkg:Array<String> = null;
+		var imports:Map<String, CustomClassImport> = [];
+		for (decl in module) {
+			switch (decl) {
+				case DPackage(path):
+					pkg = path;
+				case DImport(path, _):
+					if (importBlocklist.contains(path.join(".")))
+						continue;
+					var last = path[path.length - 1];
+
+					var importedClass:CustomClassImport = {
+						name: last,
+						pkg: [for (e in path) e.trim()],
+						fullPath: path.join(".")
+					}
+					imports.set(importedClass.name, importedClass);
+				case DClass(c):
+					var extend = c.extend;
+					if (extend != null) {
+						var superClassPath = new Printer().typeToString(extend);
+						if (imports.exists(superClassPath)) {
+							switch (extend) {
+								case CTPath(_, params):
+									extend = CTPath(imports.get(superClassPath).pkg, params);
+								case _:
+							}
+						}
+					}
+					var classDecl:ClassDecl = {
+						name: c.name,
+						params: c.params,
+						meta: c.meta,
+						isPrivate: c.isPrivate,
+						extend: extend,
+						implement: c.implement,
+						fields: c.fields,
+						isExtern: c.isExtern
+					};
+
+					var customClassDecl:CustomClassDecl = {
+						classDecl: classDecl,
+						imports: imports,
+						pkg: pkg
+					}
+					customClassDecl.cacheFields();
+					registerCustomClass(customClassDecl);
+				case DTypedef(_):
+					//TODO: maybe make this work :3
+			}
+		}
+	}
 }
diff --git a/hscript/customclass/CustomClass.hx b/hscript/customclass/CustomClass.hx
new file mode 100644
index 0000000..90fb360
--- /dev/null
+++ b/hscript/customclass/CustomClass.hx
@@ -0,0 +1,412 @@
+package hscript.customclass;
+
+import hscript.utils.UnsafeReflect;
+import haxe.Constraints.Function;
+import hscript.Expr;
+import hscript.Expr.VarDecl;
+import hscript.Expr.FunctionDecl;
+import hscript.Expr.FieldDecl;
+
+using Lambda;
+using StringTools;
+
+/**
+ * Provides handlers for custom classes.
+ * Based on Polymod Hscript class system
+ * @see https://github.com/larsiusprime/polymod/tree/master/polymod/hscript/_internal
+ */
+@:access(hscript.customclass.CustomClassDecl)
+class CustomClass implements IHScriptCustomAccessBehaviour{
+    public var interp:Interp;
+
+    public var superClass:Dynamic;
+    public var superConstructor(default, null):Dynamic;
+
+    public var className(get, never):String;
+
+    private var __class:CustomClassDecl;
+    private var _cachedSuperFields:Null<Map<String, Dynamic>> = null;
+
+    private var _cachedFieldDecls:Map<String, FieldDecl> = null;
+	private var _cachedFunctionDecls:Map<String, FunctionDecl> = null;
+	private var _cachedVarDecls:Map<String, VarDecl> = null;
+
+	public var __allowSetGet:Bool = true;
+
+    private function get_className():String {
+		var name = "";
+		if (__class.pkg != null) {
+			name += __class.pkg.join(".");
+		}
+		name += __class.classDecl.name;
+		return name;
+	}
+
+    public function new(__class:CustomClassDecl, args:Array<Dynamic>, ?extendFieldDecl:Map<String, Dynamic>, ?ogInterp:Interp) {
+        this.__class = __class;
+        this.interp = new Interp(this);
+
+        if(ogInterp != null && ogInterp.importFailedCallback != null && ogInterp.errorHandler != null) {
+			interp.importFailedCallback = ogInterp.importFailedCallback;
+			interp.errorHandler = ogInterp.errorHandler;
+            interp.allowStaticVariables = ogInterp.allowStaticVariables;
+            interp.staticVariables = ogInterp.staticVariables;
+		}
+
+        buildImports();
+
+        if(extendFieldDecl != null)
+			_cachedSuperFields = extendFieldDecl;
+
+        buildClass();
+
+        if(hasFunction('new')) {
+            buildSuperConstructor();
+            callFunction('new', args);
+            if(this.superClass == null && this.__class.classDecl.extend != null)
+                this.interp.error(ECustom("super() not called"));
+        }
+        else if(__class.classDecl.extend != null) {
+            createSuperClass(args);
+        }
+    }
+
+    function buildClass() {
+        _cachedFieldDecls = [];
+		_cachedFunctionDecls = [];
+		_cachedVarDecls = [];
+
+        if(_cachedSuperFields == null) _cachedSuperFields = [];
+
+        for (f in __class.classDecl.fields) {
+			if(f.access.contains(AStatic)) continue; // Skip static field. It's handled by CustomClassDecl.hx
+			_cachedFieldDecls.set(f.name, f);
+			switch (f.kind) {
+				case KFunction(fn):
+					_cachedFunctionDecls.set(f.name, fn);
+				case KVar(v):
+					_cachedVarDecls.set(f.name, v);
+					if (v.expr != null) {
+						var varValue = this.interp.expr(v.expr);
+						this.interp.variables.set(f.name, varValue);
+					}
+			}
+		}
+
+		if(!_cachedSuperFields.empty()) {
+			for (f => v in _cachedSuperFields) {
+				this.hset(f, v);
+			}
+			_cachedSuperFields.clear();
+		}
+    }
+
+    function buildSuperConstructor() {
+        superConstructor = Reflect.makeVarArgs(function(args:Array<Dynamic>) {
+			createSuperClass(args);
+		});
+    }
+
+    private function createSuperClass(args:Array<Dynamic> = null) {
+		if (args == null)
+			args = [];
+
+		var extendString = new Printer().typeToString(__class.classDecl.extend);
+		if (__class.pkg != null && extendString.indexOf(".") == -1) {
+			extendString = __class.pkg.join(".") + "." + extendString;
+		}
+
+		if (Interp.customClassExist(extendString)) {
+			var abstractSuperClass:CustomClass = new CustomClass(Interp.getCustomClass(extendString), args, _cachedSuperFields, this.interp);
+			superClass = abstractSuperClass;
+		} else {
+			var c = Type.resolveClass('${extendString}_HSX');
+			if (c == null) {
+				interp.error(ECustom("could not resolve super class: " + extendString));
+			}
+			if(_cachedSuperFields != null) {
+				Reflect.setField(c, "__cachedFields", _cachedSuperFields); // Static field
+			}
+			
+			superClass = Type.createInstance(c, args);
+			superClass.__customClass = this;
+			superClass.__real_fields = Type.getInstanceFields(c);
+		}
+	}
+
+    function buildImports() {
+        // TODO: implement Alias imports
+		var i:Int = 0;
+		for(_import in __class.imports) {
+			var importedClass = _import.fullPath;
+            
+			if(Interp.customClassExist(importedClass) && this.interp.importFailedCallback != null) {
+				this.interp.importFailedCallback(importedClass.split("."));
+				continue;
+			}
+            
+			#if hscriptPos
+			var e:Expr = {
+				e: ExprDef.EImport(importedClass),
+				pmin: 0,
+				pmax: 0,
+				origin: this.className,
+				line: i
+			};
+			#else
+			var e = Expr.EImport(importedClass);
+			#end
+			this.interp.expr(e);
+			i++;
+		}
+    }
+
+	public function callFunction(name:String, args:Array<Dynamic> = null):Dynamic {
+		var r:Dynamic = null;
+
+		if (hasField(name)) {
+			var fn = getFunction(name);
+			var previousValues:Map<String, Dynamic> = [];
+			var i = 0;
+			for (a in fn.args) {
+				var value:Dynamic = null;
+
+				if (args != null && i < args.length) {
+					value = args[i];
+				} else if (a.value != null) {
+					value = interp.expr(a.value);
+				}
+				// NOTE: We assign these as variables rather than locals because those get wiped when we enter the function.
+				if (interp.variables.exists(a.name)) {
+					previousValues.set(a.name, interp.variables.get(a.name));
+				}
+				interp.variables.set(a.name, value);
+				i++;
+			}
+			try{
+				r = interp.execute(fn.body);
+			}
+			catch(e:hscript.Expr.Error){
+				// A script error occurred while executing the script function.
+				// Purge the function from the cache so it is not called again.
+				purgeFunction(name);
+			}
+
+			for (a in fn.args) {
+				if (previousValues.exists(a.name)) {
+					interp.variables.set(a.name, previousValues.get(a.name));
+				} else {
+					interp.variables.remove(a.name);
+				}
+			}
+		} else {
+			var fixedArgs = [];
+			// OVERRIDE CHANGE: Use _HX_SUPER__ when calling superclass
+			var fixedName = '_HX_SUPER__${name}';
+			for (a in args) {
+				if ((a is CustomClass)) {
+					fixedArgs.push(cast(a, CustomClass).superClass);
+				} else {
+					fixedArgs.push(a);
+				}
+			}
+			var superFn = Reflect.field(superClass, fixedName);
+			if(superFn == null) {
+				this.interp.error(ECustom('Error while calling function super.${name}(): EInvalidAccess'
+					+ '\n'
+					+ 'InvalidAccess error: Super function "${name}" does not exist! Define it or call the correct superclass function.'));
+			}
+			r = Reflect.callMethod(superClass, superFn, fixedArgs);
+		}
+		return r;
+	}
+
+    private function hasField(name:String):Bool {
+		return _cachedFieldDecls != null ? _cachedFieldDecls.exists(name) : false;
+	}
+
+    private function getField(name:String):FieldDecl {
+		return _cachedFieldDecls != null ? _cachedFieldDecls.get(name) : null;
+	}
+
+    private function hasVar(name:String):Bool {
+		return _cachedVarDecls != null ? _cachedVarDecls.exists(name) : false;
+	}
+
+    private function getVar(name:String):VarDecl {
+		return _cachedVarDecls != null ? _cachedVarDecls.get(name): null;
+	}
+
+    private function hasFunction(name:String):Bool {
+        return _cachedFunctionDecls != null ? _cachedFunctionDecls.exists(name) : false;
+    }
+
+    private function getFunction(name:String):FunctionDecl {
+        return _cachedFunctionDecls != null ? _cachedFunctionDecls.get(name) : null;
+    }
+
+    private function cacheSuperField(name:String, value:Dynamic) {
+		if(_cachedSuperFields != null) {
+			_cachedSuperFields.set(name, value);
+		}
+	}
+
+    var __superClassFieldList:Array<String> = null;
+
+	public function superHasField(name:String):Bool {
+		if(superClass == null) return false;
+
+		// Reflect.hasField(this, name) is REALLY expensive so we use a cache.
+		if(__superClassFieldList == null) {
+			__superClassFieldList = Reflect.fields(superClass).concat(Type.getInstanceFields(Type.getClass(superClass)));
+		}
+
+		return __superClassFieldList.indexOf(name) != -1;
+	}
+
+	/**
+	 * Remove a function from the cache.
+	 * This is useful when a function is broken and needs to be skipped.
+	 * @param name The name of the function to remove from the cache.
+	 */
+	private function purgeFunction(name:String):Void {
+		if (_cachedFunctionDecls != null) {
+			_cachedFunctionDecls.remove(name);
+		}
+	}
+
+    // Access fields
+
+    public function hget(name:String):Dynamic {
+        return resolveField(name);
+    }
+
+    public function hset(name:String, val:Dynamic):Dynamic {
+        switch (name) {
+            default:
+                if (hasVar(name)) {
+                    if(__allowSetGet && hasFunction('set_${name}')) 
+                        return __callSetter(name, val);
+
+                    this.interp.variables.set(name, val);
+                }
+                else if (this.superClass != null) {
+                    if(Type.getClass(this.superClass) == null) {
+                        // Anonymous structure
+                        if(Reflect.hasField(this.superClass, name)) {
+                            Reflect.setField(this.superClass, name, val);
+                        }
+                        return val;
+                    }
+					else if (this.superClass is CustomClass) {
+						var superCustomClass:CustomClass = cast(this.superClass, CustomClass);
+						try {
+                            superCustomClass.__allowSetGet = this.__allowSetGet;
+							return superCustomClass.hset(name, val);
+						} catch (e:Dynamic) {}
+					}
+                    else if(superHasField(name)){
+                        if(__allowSetGet)
+                            Reflect.setProperty(this.superClass, name, val);
+                        else
+                            Reflect.setField(this.superClass, name, val);
+                    }
+                    else {
+						throw "field '" + name + "' does not exist in custom class '" + this.className + "' or super class '"
+							+ Type.getClassName(Type.getClass(this.superClass)) + "'";
+                    }
+                }
+				else {
+					throw "field '" + name + "' does not exist in custom class '" + this.className + "'";
+				}
+        }
+        return val;
+    }
+
+    public function __callGetter(name:String):Dynamic {
+        __allowSetGet = false;
+        var r = callFunction('get_${name}');
+        __allowSetGet = true;
+        return r;
+    }
+
+	public function __callSetter(name:String, val:Dynamic):Dynamic {
+        __allowSetGet = false;
+        var r = callFunction('set_${name}', [val]);
+        __allowSetGet = true;
+        return r;
+    }
+    
+    private function resolveField(name:String):Dynamic {
+        switch (name) {
+            case "superClass":
+				return this.superClass;
+			case "createSuperClass":
+				return this.createSuperClass;
+			case "hasFunction":
+				return this.hasFunction;
+			case "callFunction":
+				return this.callFunction;
+            default:
+				if (hasFunction(name)) {
+					var fn:Function = Reflect.makeVarArgs(function(args:Array<Dynamic>) {
+						return this.callFunction(name, args);
+					});
+
+					return fn;
+				}
+
+				if (hasVar(name)) {
+					var value:Dynamic = null;
+
+                    if(__allowSetGet && hasFunction('get_${name}')) {
+                        value = __callGetter(name);
+                    }
+					else if (this.interp.variables.exists(name)) {
+						value = this.interp.variables.get(name);
+					} else {
+						var v = getVar(name);
+
+						if (v.expr != null) {
+							value = this.interp.expr(v.expr);
+							this.interp.variables.set(name, value);
+						}
+					}
+
+					return value;
+				}
+
+                if (this.superClass != null) {
+                    if (Type.getClass(this.superClass) == null) {
+                        // Anonymous structure
+                        if (Reflect.hasField(this.superClass, name)) {
+                            return Reflect.field(this.superClass, name);
+                        } else {
+                            throw "field '" + name + "' does not exist in custom class '" + this.className + "' or super class '"
+                                + Type.getClassName(Type.getClass(this.superClass)) + "'";
+                        }
+                    }
+
+					if (this.superClass is CustomClass) {
+						var superCustomClass:CustomClass = cast(this.superClass, CustomClass);
+						try {
+                            superCustomClass.__allowSetGet = this.__allowSetGet;
+							return superCustomClass.hget(name);
+						} catch (e:Dynamic) {}
+					}
+
+                    var fields = Type.getInstanceFields(Type.getClass(this.superClass));
+					if (fields.contains(name)) {
+						return __allowSetGet ? Reflect.getProperty(this.superClass, name) : Reflect.field(this.superClass, name);
+					} else {
+						throw "field '" + name + "' does not exist in custom class '" + this.className + "' or super class '"
+							+ Type.getClassName(Type.getClass(this.superClass)) + "'";
+					}
+                }
+                else {
+                    throw "field '" + name + "' does not exist in custom class '" + this.className + "'";
+                }
+        }
+        return null;
+    }
+}
diff --git a/hscript/customclass/CustomClassDecl.hx b/hscript/customclass/CustomClassDecl.hx
new file mode 100644
index 0000000..f49c920
--- /dev/null
+++ b/hscript/customclass/CustomClassDecl.hx
@@ -0,0 +1,150 @@
+package hscript.customclass;
+
+import hscript.customclass.utils.FunctionUtils;
+import haxe.Constraints.Function;
+import hscript.Expr.FieldDecl;
+import hscript.Expr.VarDecl;
+import hscript.Expr.FunctionDecl;
+
+@:structInit
+class CustomClassDecl implements IHScriptCustomAccessBehaviour {
+	public var classDecl:Expr.ClassDecl;
+	public var imports:Map<String, CustomClassImport>;
+	public var pkg:Null<Array<String>> = null;
+
+	public var staticInterp:Interp = new Interp();
+
+	var _cachedStaticFields:Map<String, FieldDecl> = [];
+	var _cachedStaticFunctions:Map<String, FunctionDecl> = [];
+	var _cachedStaticVariables:Map<String, VarDecl> = [];
+
+	public var __allowSetGet:Bool = true;
+
+	public function cacheFields() {
+		for (f in classDecl.fields) {
+			if (f.access.contains(AStatic)) {
+				_cachedStaticFields.set(f.name, f);
+				switch (f.kind) {
+					case KFunction(fn):
+						_cachedStaticFunctions.set(f.name, fn);
+					case KVar(v):
+						_cachedStaticVariables.set(f.name, v);
+						if (v.expr != null) {
+							var varValue = this.staticInterp.expr(v.expr);
+							this.staticInterp.variables.set(f.name, varValue);
+						}
+				}
+			}
+		}
+	}
+
+	public function callFunction(name:String, ?args:Array<Dynamic>) {
+		var func:FunctionDecl = getFunction(name);
+
+		if(func != null) {
+			return FunctionUtils.callStaticFunction(name, this, staticInterp, func, args != null ? args : []);
+		}
+
+		return null;
+	}
+
+	public function hasField(name:String):Bool {
+		return _cachedStaticFields.exists(name);
+	}
+
+	private function hasFunction(name:String) {
+		return _cachedStaticFunctions.exists(name);
+	}
+
+	private function getFunction(name:String):FunctionDecl {
+		return _cachedStaticFunctions.get(name);
+	}
+
+	private function hasVar(name:String):Bool {
+		return _cachedStaticVariables.exists(name);
+	}
+
+	private function getVar(name:String):Dynamic {
+		var staticVar = _cachedStaticVariables.get(name);
+
+		if(staticVar != null) {
+			var varValue:Dynamic = null;
+			if(!this.staticInterp.variables.exists(name)) {
+				if(staticVar.expr != null) {
+					varValue = this.staticInterp.expr(staticVar.expr);
+					this.staticInterp.variables.set(name, varValue);
+				}
+			}
+			else {
+				varValue = this.staticInterp.variables.get(name);
+			}
+			return varValue;
+		}
+
+		return null;
+	}
+
+	/**
+	 * Remove a function from the cache.
+	 * This is useful when a function is broken and needs to be skipped.
+	 * @param name The name of the function to remove from the cache.
+	 */
+	private function purgeFunction(name:String):Void {
+		if (_cachedStaticFunctions != null) {
+			_cachedStaticFunctions.remove(name);
+		}
+	}
+
+	public function hget(name:String):Dynamic {
+		var r:Dynamic = null;
+
+		if(hasVar(name)) {
+			if(__allowSetGet && hasFunction('get_${name}'))
+				r = __callGetter(name);
+			else 
+				r = getVar(name);
+			return r;
+		}
+		if(hasFunction(name)) {
+			var fn:Function = Reflect.makeVarArgs(function(args:Array<Dynamic>) {
+				return this.callFunction(name, args);
+			});
+			return fn;
+		}
+
+		throw "static field '" + name + "' does not exist in custom class '" + this.classDecl.name + "'";
+	}
+
+	public function hset(name:String, val:Dynamic):Dynamic {
+		if (hasVar(name)) {
+			if (__allowSetGet && hasFunction('set_${name}'))
+				return __callSetter(name, val);
+			else {
+				this.staticInterp.variables.set(name, val);
+				return val;
+			}
+		}
+
+		throw "static field '" + name + "' does not exist in custom class '" + this.classDecl.name + "'";
+	}
+
+	public function __callGetter(name:String):Dynamic {
+		__allowSetGet = false;
+		var r = callFunction('get_${name}');
+		__allowSetGet = true;
+		return r;
+	}
+
+	public function __callSetter(name:String, val:Dynamic):Dynamic {
+		__allowSetGet = false;
+		var r = callFunction('set_${name}', [val]);
+		__allowSetGet = true;
+		return r;
+	}
+}
+
+typedef CustomClassImport = {
+	var ?name:String;
+	var ?pkg:Array<String>;
+	var ?fullPath:String; // pkg.pkg.pkg.name
+}
diff --git a/hscript/customclass/utils/FunctionUtils.hx b/hscript/customclass/utils/FunctionUtils.hx
new file mode 100644
index 0000000..26f121a
--- /dev/null
+++ b/hscript/customclass/utils/FunctionUtils.hx
@@ -0,0 +1,46 @@
+package hscript.customclass.utils;
+
+import hscript.Expr.FunctionDecl;
+
+@:access(hscript.customclass.CustomClassDecl)
+class FunctionUtils {
+    public static function callStaticFunction(name:String, classDecl:CustomClassDecl, interp:Interp, fn:FunctionDecl, args:Array<Dynamic> = null) {
+		var r:Dynamic = null;
+
+		var previousValues:Map<String, Dynamic> = [];
+		var i = 0;
+		for (a in fn.args) {
+			var value:Dynamic = null;
+
+			if (args != null && i < args.length) {
+				value = args[i];
+			} else if (a.value != null) {
+				value = interp.expr(a.value);
+			}
+			// NOTE: We assign these as variables rather than locals because those get wiped when we enter the function.
+			if (interp.variables.exists(a.name)) {
+				previousValues.set(a.name, interp.variables.get(a.name));
+			}
+			interp.variables.set(a.name, value);
+			i++;
+		}
+		try {
+			r = interp.execute(fn.body);
+		} catch (e:hscript.Expr.Error) {
+			// A script error occurred while executing the script function.
+			// Purge the function from the cache so it is not called again.
+            classDecl.purgeFunction(name);
+			interp.error(#if hscriptPos e.e #else e #end);
+		}
+
+		for (a in fn.args) {
+			if (previousValues.exists(a.name)) {
+				interp.variables.set(a.name, previousValues.get(a.name));
+			} else {
+				interp.variables.remove(a.name);
+			}
+		}
+
+		return r;
+	}
+}
\ No newline at end of file
diff --git a/hscript/macros/ClassExtendMacro.hx b/hscript/macros/ClassExtendMacro.hx
index 18e5c59..91327b5 100644
--- a/hscript/macros/ClassExtendMacro.hx
+++ b/hscript/macros/ClassExtendMacro.hx
@@ -211,6 +211,15 @@ class ClassExtendMacro {
 					continue;
 				if (f.name == "new") {
 					hasNew = true;
+					switch (f.kind) {
+						case FFun(fn):
+							var constructor:Field = buildConstructor(fn.args);
+							
+							shadowClass.fields.push(constructor);
+							definedFields.push(f.name);
+						default:
+							continue;
+					}
 					continue;
 				}
 				if (f.name.startsWith(FUNC_PREFIX))
@@ -254,6 +263,11 @@ class ClassExtendMacro {
 										}
 									}
 								}
+
+								if (__customClass != null && @:privateAccess __customClass.hasFunction(name)) {
+									return __customClass.callFunction(name, [$a{arguments}]);
+								}
+
 								return super.$name($a{arguments});
 							};
 						} else {
@@ -269,6 +283,12 @@ class ClassExtendMacro {
 										}
 									}
 								}
+
+								if (__customClass != null && @:privateAccess __customClass.hasFunction(name)) {
+									__customClass.callFunction(name, [$a{arguments}]);
+									return;
+								}
+
 								super.$name($a{arguments});
 							};
 						}
@@ -339,6 +359,13 @@ class ClassExtendMacro {
 			Utils.setupMetas(shadowClass, imports);
 			Utils.processImport(imports, "hscript.utils.UnsafeReflect", "UnsafeReflect");
 
+			shadowClass.fields.push({
+				name: "__cachedFields",
+				pos: Context.currentPos(),
+				kind: FVar(macro: Map<String, Dynamic>),
+				access: [APublic, AStatic]
+			});
+
 			// Adding hscript getters and setters
 
 			shadowClass.fields.push({
@@ -348,6 +375,13 @@ class ClassExtendMacro {
 				access: [APublic]
 			});
 
+			shadowClass.fields.push({
+				name: "__customClass",
+				pos: Context.currentPos(),
+				kind: FVar(macro: hscript.customclass.CustomClass),
+				access: [APublic]
+			});
+
 			shadowClass.fields.push({
 				name: "__custom__variables",
 				pos: Context.currentPos(),
@@ -472,31 +506,38 @@ class ClassExtendMacro {
 
 			var hgetField = if(hasHgetInSuper) {
 				macro {
-					if(__allowSetGet && __custom__variables.exists("get_" + name))
-						return __callGetter(name);
-					if (__custom__variables.exists(name))
-						return __custom__variables.get(name);
+					if(__custom__variables != null) {
+						if(__allowSetGet && __custom__variables.exists("get_" + name))
+							return __callGetter(name);
+						if (__custom__variables.exists(name))
+							return __custom__variables.get(name);
+					}
 					return super.hget(name);
 				}
 			} else {
 				macro {
-					if(__allowSetGet && __custom__variables.exists("get_" + name))
-						return __callGetter(name);
-					if (__custom__variables.exists(name))
-						return __custom__variables.get(name);
+					if(__custom__variables != null) {
+						if(__allowSetGet && __custom__variables.exists("get_" + name))
+							return __callGetter(name);
+						if (__custom__variables.exists(name))
+							return __custom__variables.get(name);
+					}
 					return UnsafeReflect.getProperty(this, name);
 				}
 			}
 
 			var hsetField = if(hasHsetInSuper) {
 				macro {
-					if(__allowSetGet && __custom__variables.exists("set_" + name))
-						return __callSetter(name, val);
-					if (__custom__variables.exists(name)) {
-						__custom__variables.set(name, val);
-						return val;
+					if(__custom__variables != null) {
+						if(__allowSetGet && __custom__variables.exists("set_" + name))
+							return __callSetter(name, val);
+						if (__custom__variables.exists(name)) {
+							__custom__variables.set(name, val);
+							return val;
+						}
 					}
-					if(__real_fields.contains(name)) {
+					
+					if(__real_fields != null && __real_fields.contains(name)) {
 						UnsafeReflect.setProperty(this, name, val);
 						return UnsafeReflect.field(this, name);
 					}
@@ -504,17 +545,20 @@ class ClassExtendMacro {
 				}
 			} else {
 				macro {
-					if(__allowSetGet && __custom__variables.exists("set_" + name))
-						return __callSetter(name, val);
-					if (__custom__variables.exists(name)) {
-						__custom__variables.set(name, val);
-						return val;
+					if(__custom__variables != null) {
+						if(__allowSetGet && __custom__variables.exists("set_" + name))
+							return __callSetter(name, val);
+						if (__custom__variables.exists(name)) {
+							__custom__variables.set(name, val);
+							return val;
+						}
 					}
-					if(__real_fields.contains(name)) {
+					
+					if(__real_fields != null && __real_fields.contains(name)) {
 						UnsafeReflect.setProperty(this, name, val);
 						return UnsafeReflect.field(this, name);
 					}
-					__custom__variables.set(name, val);
+					if(__custom__variables != null) __custom__variables.set(name, val);
 					return val;
 				}
 			}
@@ -579,6 +623,32 @@ class ClassExtendMacro {
 
 		return fields;
 	}
+
+	static function buildConstructor(constArgs:Array<FunctionArg>):Field {
+		var superCallArgs:Array<Expr> = [for (arg in constArgs) macro $i{arg.name}];
+
+		return {
+			name: 'new',
+			access: [APublic],
+			pos: Context.currentPos(),
+			kind: FFun({
+				args: constArgs,
+				expr: macro
+				{
+					// Call the super constructor with appropriate args
+					super($a{superCallArgs});
+
+					if(__cachedFields != null) {
+						for(k => v in __cachedFields) {
+							Reflect.setProperty(this, k, v);
+							trace(k);
+						}
+						__cachedFields = null;
+					}
+				},
+			}),
+		};
+	}
 }
 #else
 class ClassExtendMacro {