Spit 78- Don't forget if you intend to build in the uk the kit/plan has to be approved by the PFA
current list here-
http://www.pfa.org.uk/pdfs/Hombuilt%...0by%20Type.pdf if not on the list then you may be the first to seek approval - could be expensive.
Genghis- Agreed V nice but I think if I had that sort of money to spend I'd be buying/ building a Thunder Mustang