Yes, it seems like you should have a way to close the windows in a driving rain. Is there a way to add ventilation at the top of the building? I know it's brick. I think it would be best to put it very high, with an awning over it to keep rain out. This is how we will do it. We will have a window on the side away from the weather because I want to give the a view and more air during hot months of summer. But most of the ventilation will be at the roof line, and perhaps some at ground level. Then our nesting boxes will be above the lower vents, the roosts higher than that, and then the high vents. Does that all make sense?