Thanks to my lurking tendecies, I got a lot of great info from here. . We built the coop 8x8. I used what we had on hand, repurposing some siding from my DH's supply to expand his shop. . I had tin for the roof on hand. Even "found" some plywood in the shop. My youngest son and husband working on the coop. At this point, the coop is predator proof and the babies are safe inside. We still need to add nesting boxes and fix the roosts. Right now the roost is just leaning there for them to play on. They are only 2 weeks. That is not an "open" window. It is covered with expanded metal from 6 inches above the opening all the way to the floor. That's to give them breeze and a view of the sunset. We don't have the run done yet, but it will be 16 x 24 with a top cover. I'm starting "small" with what I can afford, with plans to expand. I have 10 babies now and 3 more coming next week. What do you think?