https://www.ag.ndsu.edu/extension-aben/buildingplans/poultry
https://www.ag.ndsu.edu/aben-plans/5400.pdf
The plans can also be found on pages 64-65 of "How to Build Animal Housing: 60 Plans for Coops, Hutches, Barns, Sheds, Pens, Nest Boxes, Feeders, Stanchions, and Much More" by Carol Ekarius...