your kidding, poor kid! they didnt have to open it up more did they!
dunno, never used it, but since I have such prissy hens I am thinking about buying dollar store cheap tarps and putting nailing a few into the coop along the roof on the side above their ramps and angle down, out and stake into the ground so the snow slides off, so they come out into the sunshine somedays in the winter snow, the little princesses! Hubs keeps telling me how BAD this winter is going to be, so I better be ready!
Use furring strips for battens, do not rely on staples to attach the plastic. Use where the plastic is attached to the coop, as well as at the corners to prevent abrasion.
The roof and the N, E, and W sides at least should be shielded. Leaving the warm south side open will ensure good ventilation and limited wind.
The roof is the most important one in my climate, keeping most of the snow and rain out of the run makes for better run conditions. You will need to fabricate rafters to support the plastic so that rain and snow can slide off.