I'm enjoying this mod and have thoughts
-The shrink ray is incredibly expensive for someone who just wants to hop into the content you made.
--My recommendation would be making a cheap consumable item and, make the shrink ray no longer use durability, because nether star.
---What I'd do for the consumable shrink item is to bottle dirt and, put the bottled dirt into a furnace, resulting in a potion that doesn't stack (balancing the ease of obtaining them)
-I noticed that different entities have different internal layouts. I love this but, would like more variety between animals. Fun fact cows have four stomachs.
-It would be awesome if the XX exclusive orifice could also be explored in this mod.
I know you don't have a lot of interest in working on this mod save for updating it for versions of MC you are interested in. If it's alright with you I'd like to work on it with you or make my own fork of the project. I think I am familiar with the software you use to make the mod but, I am not sure how you made things work.