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The acrylic I got was from Hobby Lobby for $3 with a half off coupon. It was super thin and definitely not shatterproof! I would guess it was maybe 1/32 or thinner, and a similar size.
It may be possible to do a good enough job attaching your Kammback to your car (and make it stiff enough) to have the ability to cut it and hinge it allowing access to the trunk. I knew mine was temporary and I still had trunk access, so never went forward with this route.
If you were going to do the full kammback, and want it to last, you could look into getting a bike carrier and mounting it on your trunk lid to attach the kammback to... or maybe get a second trunk lid to do a "permanent attachment" to (so you don't put holes in your original)... something better than duct tape.
Something else to keep in mind, dust collects on your rear window with a kammback in place, so either you would want to seal off the interior of the kammback completely, or have some way of cleaning the glass. Sealing it off completely would be difficult, I used duct tape to seal the edges, and around the glass, but after a couple months, there was water leaking in when it would rain (just in a couple places, but I could never track down where the weak points were...). Having the ability to see out is pretty nice.
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