I agree with the light coloured tyres, they go nicely with the frame - I've been looking at Schwalbe Delta Cruisers, but don't really know which would be best.
Brave putting the prices up on here, but it's good to see how it comes together!
I've just been testing out the Hero 2 with the chest mount on the commute to work, and apart from looking like you're wearing suspenders, it does give a good angle for seeing what's going on with the bike - should be good for the mtb'ing I'm planning for it!
2nd Dibs on the nikon:
what battery does it take?
any stiction with the lens?
Thanks