I'm pondering the idea of making a kammback for my '93 Chevy Lumina. It would extend from the rear window down to the tip of my trunk. I would use lexan and aluminum bars to attach the lexan to for support. Below is a quick sketch of what it would be shaped like on my car.
Also, please note, on the second picture, my spoiler is attached, it is no longer attached which means I have some holes I could use in the future for attaching the kammback if necessary. I'm not very familiar with how any of you have made kammbacks for your cars so I would like to hear how you made them and what materials you used. At the moment, I'm thinking of using Lexan and aluminum bars with screws to attach the lexan to the bars.