I'm not in the market for another frame/bike. Really, I swear I'm not. But I'm hearing a very sweet siren song with this layout. I'd almost certainly run 700x32's instead of 42s. I sure hope to see photos of the final product.

I have a couple mid-1960s Cinellis (which I love) that have similar geometry. Your design has 2cm longer seat tube, a 0.5cm shorter effective top tube, a 1cm lower BB, and close to the same angles, wheelbase and chainstays. I run my saddles at 85cm, which would work just fine with your design. It would be a blast to do a compare-and-contrast. But then, I'm not in the market for another frame/bike. No, really, I swear . . . .

Out of curiosity, what tubing are you thing of using? Mine have SP, great for a heavy guy like me (255#). Will this bad boy have something comparable?