And let's not forget Longstaff's ability and willingness to produce trike conversion kits, both braze-on and bolt-on. Although I didn't see this on their website, I spoke with the Longstaff crew about this at NAHBS (it's a strong possibility for an on-topic frameset now in hand, just for the fun o f it). They also had an example on hand.
This ties in with one of the other groups of comments in the KOF strings lately: What about riders who are getting older? I was talking about the NAHBS weekend with my 60-something boss on Monday, a fellow who rides about 10 mostly-paved miles once or twice a week. He really enjoys it, but he's facing the fact that a fall will cause more problems than ever before. He was delighted to find that he could convert the bike he enjoys now into a trike and not look like a dork riding a "shopper trike."
Dan Kehew
Davis, CA