If you want it to look stock, the easiest way is to trim the polycarbonate (lexan is a brand name) as close to the opening as possible, and attach it with urethane. Then get some of the 80's GM windshield trim (think Cavalier or Camaro) the kind that is flushmount between the glass and the body, and use it, you can trim off the tab that goes down between the body and glass, and SPARINGLY apply urethane to the trim and set it in place, once the urethane dries, it will stay in place. It won't be factory looking, but most people will never notice. The poly will have to be so thick to match the existing glass thickness so the windshield rubber will hold it in properly, that you lose the majority of the weight savings, my reasoning for doing it this way. To get the curve in the glass on the ends, do a cardboard template of the curve, and let the poly sit in the sun for a few hours. Then you will need to form it, (easier to do when the poly is warm, hence the sunlight) a baseball bat works nicely for the curve, just carefully work the poly over the bat until you form the shape you want. Takes more patience than skill, go slow, and don't overwork it. If you do it correctly, you won't leave a 'crazed area' (will look like little cracks inside the plastic). Not as hard as it sounds, but try to work just on the very edge of the first piece you try, as it most likely will end up becoming your back glass...
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