I built one last spring kinda... I drug an old shed outs of the woods that had a good roof on it, and re-sheeted the sides and added a nesting box.. Then built a 12'x7' pen and screwed it to the front of the coop. Will snap a few pics tomorrow and put them up for ya. Pretty fun stuff.
here is a city coop i built in the burgh. fits 3 hens now. there is a nest box on the other side. inside there is a poop board that has saved the day. i scoop litter every 3 days and have yet to clean out the deep litter method with pine shavings since march!
The actual Coop dimensions are 8' L x 4'W x 8'H
It will roost 12 chickens comfortably. The floor of the coop is elevated 2 feet off the ground. The space underneath is shared access for the birds to retreat from the heat and to dust themselves. And as a storage space for clean wood shavings.
The tin covered run is 8'x 12' with a door to keep them under if need be.
The open air run is about 15' x 12' with string run across the top to discourage young hens from attempting to fly out. Because they have. Though I do free range them.
Nest box is accessed from outside the coop. Three nest boxes. One box will accomodate 3 hens. So 3 is ample for the dozen hens I have. Most times they use only 2.
Outside access to clean the coop. Storage compartment below. Four homemade windows for summer ventilation. I even went so far as to insulate the coop and it keeps the inside a bit cooler in the blazing summer sun. The tin color is light colored to reflect suns rays and keep from retaining heat.
I put a perch under the roofed run to allow younger birds an escape from the older birds punishment as pecking order is established and a reason to exercise the wings.