And you sure as hell don't want to get in an MVA with those. State inspections require DOT legal glass for a reason. It's to make it possible to drag your bleeding ass out of a vehicle safer. Side window glass shatters that way for a reason. Windshield glass shatters that way for a reason. If I HAD to go lexan, it would be behind the C pillar only. If I NEVER had passengers in the rear, I still wouldn't put it in the doors. Sometimes the only way to keep your spinal column from severing nerves is to have someone hold your head from the rear seat. Sometimes, the only way in is through that rear door window. I want the medics to have as little trouble as possible getting to me.
Have fun with your Lexan though. I hope to god I don't get sent on the call and have to watch you die because you wanted to save a couple of pounds of vehicle weight. Knowing that you may have lived if you had just left the glass alone. I've seen enough people die for stupid reasons.