Lexan isn't street legal and it will yellow, warp, scratch really easy. The general way to work with it is to get a sheet of it, pull out the glass, and use the glass as a template, it's pretty easy to cut. On the back hatch I don't think it would be a good idea since the glass is actually under stress and is used for support.
The foam he's probably talking about is pretty easy to find, go to a home improvement store, and get the foam that's made to insulate, it can come in cans, or be mixed. Though there really isn't any areas I can think of to use that, since it's not a body on frame car....
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