Thanks guys. I haven't used thumbshifters since BITD and it's taking a while to get used to them again but I love the simplicity! I wanted to do P2's on there but trying to find non-sus corrected threadless P2 forks is proving quite difficult and/or expensive. I have a Kelly 410mm rigid but it looked and felt a little "long" in the front so it's waiting for a frame to go on...
It's a nice looking build, although it is cheating a bit to have a size 17 because all size 17 Konas look quite good!
I agree with Geoff that the fork looks good on it, but I'm puzzled by what you say about the axle to crown length. The frame is definitely 'suspension-corrected', and was designed for a 41cm a-c fork. That's from the centre of the axle to the base of the crown race. So it would have a 71 degree head angle with a 41cm P2 or with your Kelly fork and that is what it was designed for. There's nothing wrong though with fitting a non suspension-corrected fork if you prefer even livelier handling - a 38/39cm fork would give you a head angle of 72-73 degrees.