Thanks for all the suggestions! I didn't think converting the stall would be so much engineering! We don't have weasels, so raccoons are really our only major issue. The barn cats take care of rodents, so we don't see much in the barn (we do have hoofed creatures in the barn, too). I figured out a way to angle over to one of the beams with machine wire and found a ridiculously heavy marine storage canvas to screw into the flat portion as a roof. I decided to move the grain into the barn kitchen since we don't use it and converted the closed grain room into the chicken sleeping quarters. I'll cut a hole in the wall to the enclosed stall and create a door that can be closed up at night.