Welcome. I had a tornado take out two Scamps in my back yard a few years back. One was a 77 S-13. The front window on mine was the curved rubber gasket window. Replace it with 3/16" plexi-glass, just cut to fit and get your gasket from Scamp
. My back window had an aluminum frame with three sections. These windows
are impossible to find. My plan is to remove the frame and use plexi-glass and a rubber seal like the front window. That is how they mounted the rear window in later years. The square corner side windows are also next to impossible to find. Since you are doing a lot of glass work. Glass in the corners and use the radius windows from Scamp.