The design was taken from Jayare's Cick,s design. https://www.backyardchickens.com/forum/viewtopic.php?id=38477 We made the run part 8x8, and the coop is 8x4. I have the door going from the front, so I don't loose floor space. I am using it right now for 31 4-7 week old chicks. It has a haet lamp in the coop. We are currently lookong for scrap supplies to build more of these before the chicks outgrow it. Hubby said that he wished we saw the design for these before we built our coop, he would never have built a stationary coop.