I had 853 frame tubes and forks with Columbus chain stays (oval) and seat stays (thin as possible 11mm). So much for a standard kit. I had a huge choice of lugs (but not too fancy). The geometry was based on my best bike, which had been fitted properly, and the resulting bike is excellent. The dimensions were applied to their test frame to check, in case refinements were needed. I asked for space for mudguards, without toe overlap. BBD will do you a bike fit if you need. I chose to have an A-head steerer but most would probably go for quill.
Phone them and ask.