[Christ]

Originally Posted by Frank Lee

Get a tent and mod it to glom on the back (or get similar materials and use similar construction). Light, easy to break down, waterproof, cheap. Has those strong yet light and flexy fiberglass poles.

I was thinking of a collapsible aluminum frame (all one piece, but can be folded in on itself/collapsed into itself, like when you lower crutches) with the boat canvas stretched over some chicken wire. The chicken wire will add enough stiffness that the canvas shouldn't deflect that much, and the whole thing can be removed/collapsed on itself, taking minimal space in the interior.

If built intelligently, a piece of the removed canvas could also double as a windshield sun-shield, as well as a couple pieces for the front windows. That would take some real engineering time, though.