As asked, finally some pictures of the modified top of my Gwendolyne ('93 Sidekick):
It's simply a normal top, cutted with a jigsaw, with a sheet of polycarbonate bolted on. Very easy to do, take only about 1 hour (plus the time for the silicone to cure).
It use to be completely transparent but I add a sheet of smoked plastic last summer when the top of my head begin to look like fried chicken.
