Really good looking and understated frame and liking the sound of the build but...
- ... please don't build it as a singlespeed as even if you get an eccentric disc hub (WI ENO?) or b/b you'll still have all those surplus cable guides - why have a £2.5k frame and then have it compromised? Want a ss Ti IF? Get a Ti Deluxe SS. Or even a PISSOFF (now we're talking).
- ...I'm really not understanding the forks at all. You get a pair of rare forks then extend the legs, cut off the canti/v mounts, add a disc tab and then respray. Why not just get Kevin Winter or another framebuilder to fabricate the fork that you want - surely that wouldn't be more expensive than buying and adapting a BOI? That said, the cost is not exactly my point.
Sorry to sound negative, obviously your frame to do with what you wish and I'm sure you'll make a great job.