The snap dragon together with the Chadwick folding DB are actually what prompted me I think. It is just that the shape and the scale of both are not what most of us (or guitardists) would be looking for.
But what if you could take your normal P or J (or whatever) and turn it into a long scale full body equivalent? Travel on the tube, space in car etc would be better/easier. I have travelled with the neck detached before (stuffing it in a suitcase), which works but it became quite unwieldly. Hence the idea to have a gig bag (let's say 2 models: 1 for guitar and 1 for bass) that comes with an instrument conversion kit so you can fit your instrument in the bag.
I think the time to fold and rebuild needs to be short, and that is where I think I have had a real epifany.
Anyway, will let this run for a while whilst I am working on a prototype, generally a very slow affair given I have a busy enough job working, gigging and being a Dad, but we'll get there.