My N+1 is maybe a little bit less exotic... It's something that doesn't quite exist yet - I have specs in mind, it's just getting the bits and building the bike. Basically I want a MTB but with gearing for the flat as a winter / mucky road / crappy road surface bike that has the capability to do some trails and bridleways.
13 inch hardtail frame & forks
26 inch wheels, maybe 24, it's kind of borderline given the frame size
Disc brakes, not fussed whether mechanical or hydraulic
44-32-22 triple up front
11-34 nine speed on the back
Trigger shifters
I've been thinking about this for a good year and a half now. Trouble is, a lot of junior bikes are too small / have the wrong gearing / only single chainring, and the adult bikes are too big. Don't see the point of buying a new bike only to strip half the components off, so looking for a used bike as a donor. Plus it will likely be the least used bike in my fleet, so I don't want to spend oodles. Budget for this is quite tight.