I made a 4x4 coop with scrap materials I had laying around and from what people gave me. I think all I had to buy was a few studs and some shingles. They claim all they need is 2-4 sqft per bird in the coop, which makes sense. All they do is go in to eat, sleep, and drop an egg. The run is where they need space IMO. People like chicken tractors because you can move them around to new patches of grass. Otherwise they'll work the lot down to dirt. I used to get a couple of bales of straw from time to time and chuck it in there. They seemed to like to kick it around and look for bugs.
I highly suggest putting down linoleum on the floor. It preserves the floor underneath and makes clean up easy. I've also seen people build chicken wire floors. I'm not a fan but that's me. As far as nest boxes go, I'd build three max. You'll find that the birds will share. Also, you may have to block them for a little while. The lazy hens will go in them and sleep for the night. This also means they'll crap them up and you'll have to clean them out.
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