Lawrence -
The Hummingbird is designed to either be used with 26" wheels and a suspension fork (or, I suppose a suspension corrected rigid fork) or, as I have it, with 26" rear, 29" front and the rigid fork which is designed for this set-up. It's shorter than the Swift fork, so you can't use a suspension fork and a 29" wheel, it's one or the other. I'm sold on 29" front wheels and rigid forks, so that's the only way I'll be using it.
I'm really pleased with it and probably even more so when I get some new wheels built for it - at the moment I'm just using the wheels from my Explosif 69'er singlespeed.
Cheers,
Andy.