This is an awesome project, I had started writing one of these myself to handle modular/uniform data, voxels, kitbash, greebles etc, as Unity's interface drives me mental, but this is a strong solution. I'd like to extend this if that's ok, I can setup a repo and grant you admin privs so you can integrate downstream extensions? Another thing, how did you make the interface so sexy? not even Unity Tech themselves can manage that. In almost 8 years and 1500 assets yours is the best looking editor asset i've come across. :)