Someone in the MTB forum has a Pugsley. Don't remember the drivetrain but they went full out with the wide rims and huge tires. Seeing it all assembled really is a jaw dropped. I would love to have one as well.

Scroll down, there is a SS one: http://www.bikeforums.net/showthread...hlight=pugsley

I think fixed would be cool, but you would want a really low gear. Honestly I think I would run it 1x8 speed with a friction shifter or something else bomb proof for the rear derailleur

This one is cool to. Fully geared out, disc brakes the works but he goes in depth on how well it does in the snow: http://www.bikeforums.net/showthread...hlight=pugsley