The only issue I see is you would need to use either Pablo's shifter kit, or Andy's disc-brake sprockets
That would be totally fun though. Put a 56t sprocket or larger on it, and you'd have some major pull for some fun (using Andy's sprocket)...or keep it in low gear with the shifter kit.
Holy crap, that sounds like fun. Now if only I had the money ($400, ouch). And some good areas to play in the snow here.
p.s. the videos on the site make it look really fun
Too bad you'd never get in a ski area with a motor on it. Gotta find some snowmobiling areas or something.