Thanks for the details. The chainring clearance might be an issue. How did you go about dimpling the chain stay? And what size ring is that -- a 42 or so? It looks like a pretty tight fit even with the dimpled stay, and I'm running 48x18 right now.

I'm not worried about the brake reach. I have a super-long centerpull on my current bike, and I think I also have a single R556 brake lying around as well. And I'll be running fixed, so the rear brake is optional (though I do wonder why they don't just move the brake bridge to a sensible height).