My son and I recently converted our old swing set into a chicken coop and run. The fort became the coop and the swinging part was covered in hardwire fabric for the run. In the coop, there are areas covered by hardware fabric above the pop door (2 1/2' by 2 1/2') and above the side panels (2' x 8'). This was great in the summer and kept the chickens comfortable. But I need to cover the hardware fabric to keep out the winter wind. I'd assumed we'd just screw in wood pieces to fit and then remove them in the spring. But it's just too dark in the coop if we do that. I'm guessing we need some kind of plastic covering and I thought about plexiglass but the hardware stores around here will only cut wood. Any ideas on other options? How thick does the plastic need to be? We're in Colorado. Avg winter temps at night are in the teens and 20's but we get a lot of wind. Thanks for your help!!