The sail windows were my first venture and they were a lot more time consuming.  To prevent wasting an expensive piece of Lexan, i bought a piece of much cheaper plexigalss to build the templates.  The first step was to remove the sail windows, without breaking them, and using them as the template.  Once the windows were removed, I traced their outline onto the plexiglass and used a jigsaw to cut the plexiglass.  The cut plexiglass fit very well and only required a small amount of tweaking to get the correct fit. I used the Plexiglass cut outs and repeated the process on a piece of Lexan and it worked out very well, which means I didn't waste any Lexan.

For the hatch window, I skipped the Plexiglass template and went straight to the Lexan.  I took my time and get it correct without ruining the Lexan sheet.  To add additional support to the hatch window, I installed two aluminum strips on the top of the Lexan running front to rear.  These strips should help on holding the Lexan in place and prevent it from blowing out.

The three Lexan windows are in place and still require my to paint a black edge around the windows.  This black edge will be wide enough to cover the sheet metal under the windows and they will be about 2 inches wide.  I weighed the glass and Lexan and the Lexan is about 20lbs lighter.  It doesn't sound like a lot, but the whole car weighs about 2000lbs and the glass is high on the car, so it will assist in lowering the cg.