Your Lexan windshield should not be too hard to form since it has a rather modest contour. Just take your time and shut off the cell and it will all go well. You should shave at least 10 lbs from that glass alone.
Is the plastic rear mirror you're using look like your current one?
Those side door mirrors can weigh much as well. I kept mine so as to keep the heat away from giving me flack.
I've been busy lately with work, but I have a few ideas in the works and/or already implanted. When I get a moment, I'll post 'em.