The real question is TLR, how often is the idea of perfection just that - an idea that never actually ends up being the same in reality?
I know a few people who seem to be engaged on an ultimately fruitless quest for 'the perfect bike', trouble is the goalposts keep moving. One year's it's a long-travel ti hardtail, then it's a rigid 29er, then it's a full sus 29er, next it'll be rigid singlespeed 650B, but the top tube's too long and... so it goes on, for ever. I'd rather settle for 'just right enough' and right now, 'just right enough' is 'pretty damn right' and just enjoy riding.
Thing is, the goalposts do seem to move. A few years ago - wanders back on topic - I had Setavento build me a ti frame based on a Marin Rocky Ridge because I really liked the geometry. I think if I'd known a little more about frame building, I'd have specced it differently - maybe a fatter top tube, but definitely a stronger bottom bracket area. I liked the end result, but a few years down the line, my idea of what works has changed and while I like the ti frame, I'd rather have something slacker at the front and a bit more laterally together at the rear and maybe with a lower front end and steeper seat angle for better climbing.
But while I think all those things and I could go to a custom frame builder and ask them for all that, I'd be completely reliant on them knowing how to translate that into a frame and...
Didn't you write that ace review of the Ragley Ti? Why don't you just buy one of them? I hear they're quite good 
