Can I run 26 wheels on a Soma B-side?

This may seem like a strange request, but Im looking for a small size steel frame MTB with a longer TT, lower BB. The 650B Soma B-Side 13.5 frame geometry is perfect. Yes, the BB is a little low for off road, but I will be using it for on road, with fat tires and 170 cranks so there should be enough clearance. Do you see any problems with this idea?

Thanks

Note: I posted this on the 650B forum as well.