Ok so my coop is 8x8 and is a modified version of the Purina plans. My walls are straight plywood no studs or anything like that. I have a window that came out of a storage building nothing big or anything (measurements are like 35"x22" roughly). Since I do not have any studs or anything what is the best way to put in this window in my coop? I will post pictures tomorrow if I need to. Thanks!