Eric Knapp wrote:My daughter wants me to make an electric viola so we're in a similar space. I will definitely share what I find when I get closer to starting. I have nothing yet, though.
The demands on the shape of electric violas are pretty different from those of an electric cello, because of the different playing positions.
Regarding the violin: I own a Yamaha SV120 which has a non standard neck and fingerboard. I never was satisfied with the feeling of tha board, and i think it is wise to keep that critical part as close to an acoustic instrument as possible. That was also one of the main reasons why i built the skeleton violin. Also important is the lower bow holding the tailpiece, the electronics and the chin rests. This should also resemble Your daughter's instrument as close as possible (unless she is not perfectly happy with it, of course).
If i were You i would take the criticial dimensions - including arching height, bridge height and neck angle - from Your daughter's instrument and use these as boundary conditions of Your design. Or let her draw the shape She would like most...
Completly analogously an electric Cello should be designed: the traditional playing position should ideally be maintained, and that will impose boundary conditions which must be met.