It is a very good idea and a very simple one at that, espescially when compared to my roof cowl idea, but it looks like it would be very functional as well, go for it genius I think you'll like them when your done, but be careful, a freind of mine installed lexan rear quarter windows in his Honda Civic and hated them, yeah sure they did what they were supposed to but every time it rained, the windows would flood the back seat, just use some sealer of some kind...
John