Don't have much to add but I recommend Lexan over plexiglass for windows, may be almost twice the price but will last four times longer. Here in Tx. the sun will yellow plexiglass and make it brittle in a few years. Lexan I am not sure as all have not needed replacement in over ten years of use.
Also the windows look too big, I would divide them up into 3 or 4 smaller windows, you don't want to be silhouetted or back lit by the windows.
