I remember reading somewhere there was someone working on a perfect scale Spitfire XIV, and the last thing I'd seen of it was the engine. It was a perfect replica of the Merlin, and it did run and it DID sound like it should.
It was supposed to be the most detailed aircraft model built. Now I don't know if it's till being built or not. Everything was to work...guages, levers, everything.
Ambitious it was...