There is no definitive chicken coop design, but if there were, well wouldn't you expect Ikea to have a hand in it? (Yes--I realize how ridiculous it sound to link modern Swedish design with well, the barnyard, of course it's ludicrous to even begin a standardization of backyard chicken coops.) But, it just so happens that if you troll the web long enough, you will run into every conceivable chicken coop design.
This one, well, this one takes the cake. Imagine this: using a pre-fab Ikea bunkbed to construct a poultry palace. Now this is just brilliant. Go see it right now at Ikea Hacker.