There's a special knife at Lowe's and Home Depot that will cut it or the lowcostmetals place will cut it for you for something like 5 cents a cut.
I know I'm really late, but thank you all. I ended up just buying a sheet at HD today and a knife. I hope if I build the frame strong enough it will keep out any predators. We ate our first egg today, and it was delish! I think I've only had backyard eggs once before in my life back in the 70's at my Uncle's house. I don't completely recall the taste and I'm pretty sure it was a goose egg, LOL, but I did find it was a deep orangy yellow yolk and tasted quite good!
I just looked at the weather, and it's supposed to be cold and windy tonight, but it's midnight, so I hope my birds will be ok. I need to make a cover for some of those vents to protect them from excessive winds!