Advanced modding

Well I've been wondering u can change the colors and stuff of a gun but can you change the entire weapon to the shape you want (not talking about like just replacing lets say a k2 FTC file with an ak file) I actually mean changing it the way you want (is that possible if yes please tell me if you know someone who knows how so I can contact them

Yes, you can make your own mod files. You just have to make your own model and ltb files then create your own textures. Once you have your own working model swap it like it's a cross mod.