Cubik Studio

I really wanna learn how to do the new cem's with optifine, but i dont seem to find any tutorials about it... and i dont understand how other people do it, i have seen so many, can someone please make me a tutorial or make it clear to me ;-;

Basically, you make a 3D model for a bone in Cubik Studio and then export it in JPM format so it replaces a bone of the entity you want

ok for example... i want to make a zombie arrow stuck in it's chest piece..., how does it know where i want to move the model... like u get it?