My buddy has just created a Forum for ergonomic guitar design at
http://buildingtheergonomicguitar.com/forum/ Give it a look and see if it’s something you might like. It is created as a community to share ideas about non-conventional guitar designs and ways to improve the ergonomics of guitar playing. There is the blog as well at
http://buildingtheergonomicguitar.com/ There are a lot of eye opening designs on there. Yes, there are plenty of bass guitar designs. Check out
this post for a cool bass design.
Sorry for the shameless plug,
Chad