People who want to hack/improve/expand the avatar meshes have to hack right into the .llm binary files, which is a high bar and tough to maintain (and impossible to merge). The source from which the .llm files are generated, however, is currently 'lost'. It can (and should) be reconstructed from the .llm files with some nonexistent tools and work.
Mm Alder volunteered for this in '
VWR-4794 Babble loop for voice visualization'!