There's a discussion on this here
I measured my own Impact headset at about 40 mm which seems to fit with published info e.g. http://www.bikepro.com/arch_products/he ... _hset.html But if i was you I'd measure steerer and head tube and see exactly how much space...
Just had a look to see where that XT cassette I fancied was going....
Keeping colours simple to show off the frame is a thing I like. A lot. So many builds have extra bling in slightly mismatched colours. Nice