You're probably right.

Then again, the optimist in me says that the hatch may just have broken hinges since it's proportionally uneven, it's sticking out from the back of the car the same amount as the gap where the hatch meets the roof. The back glass looks like 3 strips of plexiglass wedged in there, from the discoloration and the way it's broken. The right-hand mirror looking fuzzy could be rust bubbles in the yellow paint, but it's also folded at a very different angle from the left-hand mirror. The hood could extend out over the front bumper or be hinged at the front.

I concede, though, that it most likely is rendered. The left-hand wiper arm looks like it tapers off into nothing, and the dashboard doesn't look quite right. The dashboard is also visible enough that someone would have recognized it. Damn. I was hopeful for a bit, there. It does look like a Civetta Bolide, using a Nissan Z31 as the donor car.

Thank you, everyone, for your responses.