Hello, I am working on a mod that enhances your vanilla experience without all the complicated mess. We already have some items and code done, we mainly need people to make mob models and sprites, this mod is free so of course there is no pay included. If you wanna join us DM me and I will invite you to our mods' discord server, we are glad to meet who ever comes and helps out! (and your name will go in the forge description.)
Hey, I might be of interest in helping you out a little bit on the mob models. I am currently working on my own mod, so if it is too advanced I'd have to pass considering I'm going to make my mobs semi-complex.