Nice idea, and easy to move around. I'd like to see some inside/structural pictures to help with a new build. And how in the world would you put 40 in there? Some layout pics or diagrams with measurements would help, a lot!
Good job of showing the steps to building this coop. Inside is easy to understand and I like how you mounted the wheels. Also good with the ventilation up top. Wondering if there is enough ventilation to keep this viable during the summer months.