Colin,
I'm sure Tim has made the skeleton types before. If you haven't already found it check
this site out. Plenty of food for thought there. In terms of the construction aspects I doubt you will have many issues, you just need to find out about the right electronics to use and how that gets built in.
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Dave White
De Faoite Stringed Instruments". . . the one thing a machine just can't do is give you character and personalities and sometimes that comes with flaws, but it always comes with humanity" Monty Don talking about hand weaving, "Mastercrafts", Weaving, BBC March 2010