Rick, I have an idea for you if you haven't thought of this already. I saw that you have already drawn a "lip" around the passenger side window opening for the window. If you haven't cut out these openings yet, may I suggest to you to take a strip of Tamiya 2mm Fine Line tape and placing it around the edges of the window openings so that it may act as a clean, straight guide for cutting out your window openings. I think this will give you a very straight edge as a result of following the tape as you make the cuts for the windows. Hope this can be of a help to you.