When I ordered a custom frame, I just e-mailed the builder (Dave Lloyd) told him the geometery on my current bike and how I wanted it changed (plus a few other bits, budget, tubing preference, paint job etc). He offered plenty of advice, but it was all done by E-mail, eventually he phoned to confirm the details and a frame arrived on my doorstep a month or so later. Not sure I'd do it that way again, but the frame fits like a glove, built to an amazing quality and I couldn't be happier with it. Shame he no longer builds frames, otherwise I'd have had another off him by now.