I am in the midst of constructing this run before the winter snows are upon us and have come to a stand still. The run is 4'x8' and wraps around the 4'x6' coop. I was considering lexan polycarbonate panels for the roof and also for the walls to protect the flock from snow. Any suggestions? Here is what I have thus far.. I currently have old garage door panels covering the top until I can get a secure roof installed. The hens are locked away at night. .