On One Pompino owners...

Just run into a MAJOR fuck-up with my Pompino build, just as I was expecting to be riding it.
LBS called to tell me that the 4-arm square-taper MTB chainset I intended to use (with 42T inner and 46T outer rings & a Surly Dingle rear end setup) sticks out way too far to get a decent chainline.

This is going to be an issue whatever cranks you use, once you have the inner ring clearing the chainstay the outer one is bound to be 5mm or so further outboard. Measure the actual chainline, then re-space and re-dish the rear wheel to line up the centre of the Dingle with the centre of the chainrings. Chances are you won't have a perfect chainline on either combination, because the gap between the rings is probably bigger than the gap between the sprockets, so the best you'll ever manage is to have the same misalignment in both gears. You can actually get a perfect chainline on a 2×2 drivetrain by carefully respacing a double-fixed hub and using two conventional sprockets.