Not shopping today so
Initial startup with the cover on it indicated some interference. The rivets I put on the first gear were too long. So I ground the tails down and tried again.
At this point it's down to the finer things. I still want to get a pedal to control the speed, as it's a bit awkward taking your hands off the work to dial in the movement. Once I find that and get it jacked in I'll probably clean up the cover, make a little box over the power cord lugs and such, maybe paint it black.