I've been overly busy, but finally got a decent start on the "Kammback".
A little teaser (wood and PVC are just here for setup):
The weldable 1/2" steel tube frame is primarily wanted because the whole thing will articulate for trunk access, so I want it somewhat stiff and tough. Some of the skin will be aluminum (esp. to block solar heat gain from the back seat), but mostly it will be transparent. I'm planning to have a transparent extension piece to close the gap as much as possible. Details when I get there.
The frame needs rubber feet where it touches down.