Nice start Pineridge! I've been looking for coop/shed plans for some time, and finally have a design I like. One of the main hurdles for me was the foundation. I decided on a raised pole design similar to yours, but will use a couple of beams for the joists to rest on. Mine will be 12 x 16, but only 1/3 for the chickens. The other space will be used as a fur shed or garden shed. My slope isn't as much as yours, but I'm elevating it a little more so the chickens have a place to hide from the hawks. I'm also using treated joists and flooring, but will use standard lumber from there on up. It's nice to see a similar project to validate my ideas.