Tim_Iowa - thanks. I didn't realize the BB was different, I'm new to bike wrenching. That definitely changes the buy a group vs buy components decision.

There are road disc calipers now though - with pull to be compatible with road levers.

I'll re-examine. I think I still want to build this frame as a drop-bar bike - because I really like this frame, and because I want to build up from frame as I haven't before. I may drop the road components though - if I go with separate brakes and shifters, I think I can make this a reasonable low-cost but interesting build.