Ironically, I started working on this without knowing anyone else would want it, haha.
Updated 3/5:
Unfortunately I hate leaving projects unfinished, it seems. 
Supported Sizes: Pudgy, Thick, Chunky, Chubby, Tubby, Plump, and Corpulent.
Placeholder Sizes: Fatty, Huge, Titanic, Blob, and Blob End. These use the basic human body sprites, so no colored tummies and leg markings!
All supported sizes have their busty, stuffed, and filled variants.
Downloads can be found in my new thread.
This time for real, I’m pretty sure I wont finish the remaining sizes because I was really feeling the burnout on the corpulent edits. Someone else is free to pick up the torch though!
I did the edits but I don’t really want or need credit, since the modifications are pretty small/simple anyways. Of course I have no problem with them getting adding to the modpacks proper, as well.