Started with the prefab. Chicken math happened, so I built a new coop. I had no plan and I had to work inside a covered run and around that. Lots of blood, sweat, tears and cursing. I'm not a carpenter and did the best I could by myself. The coop is about 8x12 with an area for each of the boys in the coop and individual runs in the run. It's sturdy and no drafts. I'm working on a run addition next(should be done within a couple weeks)