We are in the process of building this coop for a small flock of 3-4 birds. https://www.hgtv.com/outdoors/gardens/animals-and-wildlife/custom-chicken-coop-plans-pictures I've already thought of some changes to make such as leaving the window out and replacing it with hardware cloth and shutters for better ventilation and am going to install a small solar vent fan on the opposite wall. Is there anything else that we should do to improve the design and make it more functional? Has anyone ever used the small vent fans from amazon? Are they worth it? I though of maybe adding a small access door/panel for the section under the coop, but am not sure if that would really be worth the time and effort.