I have an idea for the wither storm absorbing blocks!
something that could you could do is make models of the wither storm that grow each time a block is absorbed, for example the wither storm eats a block, it detects when that block is eaten, then it changes stages, but only wither smaller increments like 8 2x2x2 pixel chunks in a random area on the wither storm's back.

If you have trouble doing the models, I'll gladly help you make them! I can make the models, and you texture them! (I'm not good with textures)

HOWEVER, I can only model with blockbench, so I will likely take longer with any other modelling source.

with bigger chunks, it grows more, so the 3x3x3 block chunks add 216 2x2x2 chunks, etc. like I said, I can help with the models, so no worry.

P. S. if you want faster updates on the models (if you need them) you can add me through my discord- Super Shark Gaming#1771 (copy and paste it)

Creating procedural models with minecraft's entity modelling system would not be feasible, and making models for each time a block or any amount of blocks is absorbed would be a nightmare to create and manage (lots of models)

While I appreciate your willingness to help, again this idea isn't very feasible, and the method I have for creating the Wither Storm models actually doesn't use block bench directly. Instead, I build the models with blocks in the game then use a conversion process to transform them into entity models. I've tried building the models using block bench directly before and it got too slow. Thanks for the offer though.

its not procedural models, its growing each time a block touches the storm. its always the same model, just skipping some sub stages when certain amounts of clusters are consumed