Three years later on my XACD chinese Ti frame:

* I specced the BB too low, top tube too long (as I mentioned before)
* XACD specced the tire clearance symmetrical on top and sides. This resulted in unneccessarily bent chainstays (didn't need 1cm side clearance)
* Cable guides not ideally placed - rear brake cable guide too close to caliper, Rohloff chainstay guide doesn't secure cable around bends (could be solved be straightening chainstay)
* Top tube too high - straight top tubes are too 1970s. Should have sloped the top tube 10-15 degrees, and gotten a taller seatpost.
* Fork was too short. I replaced it with a 410mm carbon fork which works great.

Other than that, it's been good!