If Linda Manzer can build any of these machines. I'm sure she could tackle the one you suggest.

One I'd like to have would be an acoustic/electric 2 neck mandolin over guitar axe. It would save my having to switch back and forth and I could alternate easily within the song/tune. I do that now, but it takes a few seconds to reach for the mando and balance it on top of the guitar. Works when I'm playing with others, but not solo.