Fiberglass door/window guidance needed

At least you started with a pattern, when I bought my Demon with the 'glas doors, I had nothing to work with. The previous owner had glassed over the slots for the windows so I had to make brackets that bolted to the top of the doors. From there, I made a pattern for a one piece window & bought a 4 x 4 sheet of Lexan at my local home improvement store, along with the correct cutter & went after it. Mine are not perfect, but they are good enough for my bracket car.