For the window and door glass I decided to use Clover House's 0.010-inch thick "Clear Polycarbonate (Lexan)" (part #472). As shown in the photo here, I cut a single piece long enough to cover one row of windows. I attached it with Testor's Plastic Cement at two corners only. This holds the part in place to allow me to glue it in place with Krylon's "Crystal Clear Glaze". As you can see in the photo, it goes on milky-white, but dries clear. It acts as a glue. The danger with using Testors Plastic Cement is that it can dull/damage the clear plastic. If some of the Crystal Clear Glaze oozes into a window frame, it dries clear and so it won't affect the window's visibility.