Welcome FJC,
I looked into building my own, but by the time I added up all the parts, the possible insurance and registration issues and to top it off re-sale value. I decided since I don't have a name in the bike building business I just figured I'd buy new. But I have to hand it to you good luck. I also think I started out just wanting too much to start with, I was looking at a Patrick engine and a 6-speed Trans, with sprung rear suspension, heck it was already over $12K at that point alone and that didn’t include the PM wheels and calipers/rotors.
Again good luck I am looking forward to seeing the finished produc
Dave