I should add, that I did build a larger coop, after a year and a half of using the prefab, because my girls said it was too small for 3 full grown hens. They showed this, by one of the hens sleeping in the nest box, even though there really was room on the roost for all three. Chickens will be the best judge of what is enough room. Because I had my prefab, though, I knew much better what I wanted in a coop, and had an idea of how to go about it, from more time spent looking at coop pages on here. My new coop is still not large, and nothing is square, but it works. I don't have great skills, and I used only a hand saw and a rechargeable power drill and a staple gun (just to hold the hardware cloth in place while I fastened it with screws and fender washers). Partly reclaimed and partly new wood.So, it can be done, if you are determined. I never would have had a clue though, without my little prefab, and I am still using it right now as a quarantine/intro coop for 3 new pullets. They do have a place.