I knocked this one out in a few hours, i'm very much a pick something up, measure it once problem-solve later kind of person, so this is the result of having a spare chocolate tin lying about!
I've made the bridge on the tin close to the 'fretboard' and much higher than it should be, this results in a very odd way to play indeed... The pitch of the wire is determined by how hard you press down on it, not by where on the fretboard you press.
So the strings bend rather than change length.
might knock up some simple pickups as i think it's going to be too noisy for contact mic's.