Hello! I just found a great buy on a used chicken coop. The previous owners did not put in enough ventilation so I am planning on cutting a hole in the side and putting in a window. I have seen windows in the coops section that hinge on the top and are held open by a stick etc. Do you buy these windows like this or make them? Any recommendations on where to buy or how to make them would be greatly appreciated. I am looking for a window that is roughly 3' X 2'. We are looking for the most inexpensive way. Thanks!