stove opening by the door about 25% down the side. As far as a tarp--rain fly---I use an old trucker's tarp. The kind that long haul drivers use on flat beds to cover the load. It's kind of rubberized & has plenty of D-rings on it to tie it off with. Cut it to size with about a 2' over hang. Then the remaining tarp I use as a floor cover.

Make sure you use enough stove pipe to get a good draft & also to help get rid of the glowing embers that may fall out onto the roof. CB