Originally Posted by mcoine
True, and this is probably why I don't own any shimano 'mtb' hubs.
To the op, the biggest difference will be the flange spacing. So the wheel will have less lateral strength than one built with 135 spacing, or a 130 built with a 7spd hub.
You could do the Armstrong frame spacing and use a 135mm hub, too. Build the wheel, get strong arms and force it into place! I've got biker arms...no muscle...and I can do it.

Not much 'Armstrong' needed actually