I construct all of the structures and buildings on my O scale model train layout. I ... I construct all of the structures and buildings on my O scale model train layout. I used to make my own windows, until I found the Tichy windows online. They are much more realistic and come in a variety of shapes and sizes. Adding the small plastic sheets for window panes is always a bit difficult without making a mess with glue. But you only need a touch to secure them in place. Also, the optional window shades are a nice touch. I used 24 double hung windows in my latest Foursquare hotel, and I was pleased with the results.