Anyone have any experience with polycarbonate windows for the G6?

I don't know why but I'm really interested in figuring out how i can shave off as much weight possible on any car. Been doing everything possible on my sedan while still keeping it comfortable (carbon fiber/fiberglass, remove tire and Jack, AC, lightweight wheels, going to the gym, etc). My goal is at least 3000 lbs.

I'd be interested in what you guys know about polycarbonate windows and to hopefully find out how to install some before I go tint out my windows