So I was trawling Instagram and came across these:

http://www.visionaryinstruments.com/...oller-guitars/

Suffice to say, I am OBSESSED, and want to build one immediately.

Does anyone have any thoughts on where to start? Are there MIDI kits for this purpose, or should I try to design/hack something?

I've done some googling and didn't come up with much except this:

https://www.musiciansfriend.com/acce...nth-driver-kit

I think I'm probably using the wrong search terms though...