So, we have a small coop for our 4 hens and wanted to make a movable "run" that they could spend time in during the day. We used 2x4's and pvc for the frame. We went ahead and used 45 degree angles to make more room for us. The kids can stand up in there and the chickens love it. The chickens run to it when we let them out. It's not predator proof, but for our situation, it works great. The wheels make it so easy to move around and we're really happy with the end product. The door was a challenge but I finally came up with a good design that is holding up well. Thanks for looking!