I spent some time cutting out chin window templates out of fiberboard. Got both cut out and was happy with them. Unfortunately, the two windows were not exactly the same size so I had to cut both of them instead of just one. Anyway, I used the templates to cut out the Lexan sheet. Once they were close in size I finished cutting using the shear. I'll final sand later. Of course, I'll leave the protective film on until final assembly. Next is to drill and install the rivnuts. This will make the windows removable.