The first time i met Mark, it was at Kitt's trails in Suffolk. Mark had made himself a bmx frame by taking the geometry of Steve D's Fit series 2 and welding the damn thing up himself. He dubbed it, "the counter-fit" (genius!) For r&d, he took the thing out to the trails and proceeded to shred. That, my friends, is pretty much as bad ass as it gets.
You can check out Mark's work at Kilby Deuce