If you look on the right side bar of the blog, you will see a link I added for a great chicken coop design resource with plans and lots of great ideas. It was published in 1919. It is called Poultry Houses and Fixtures. Click on the link to download it. It is a large PDF, and I have it on the site for free right now. Because it is in the public domain I am thinking about re-publishing it on Amazon.com, but you can get it for free now.
Poultry Houses and Fixtures