The TT is 20.5'' from the centre of the head tube to the centre of the seat tube on an 18'' frame.That is looking sweet now! It´s on the compact side regarding TT length, isn´t it? Looks like a comfy ride.
I dressed it in the Mavic, but never cabled it up so I've no idea how it would compare. I love the Mavic and was committed to using it, however there was this nagging feeling about the XTR from the moment i sold it, firstly I put a a lot of effort into cleaning it up including a complete strip down and rebuild of the brifters, no mean feat especially as it was my first attempt at any shifters.very nice
Curious with the change back to XTR, did you ever build it with the Mavic to compare? Looks nice and clean, liking the flite too