Started on the side walls of the A-frame. Once again framed out of 1X2 and glued and screwed together and attached to the box with a heavy duty piano hinge. Cut the windows from the old canvas from the popup and am trying to integrate them into the new design. Looks like it might actually work, and weight is negligible. Just have to figure the best way to attach them and keep it watertight. Picked up some Herculiner truck bedliner paint last weekend and did a test piece to see how it will work. The cost of the black as opposed to other colors (namely white) is about half for the black, so decided to test it to see if it could be painted over. I took a piece of the same ply I am using for the roof sheathing and gave it a good coat of the bedliner paint, let it dry for a day then painted over it with some kilz exterior primer. Covered in one coat. Let that dry and ran it through its paces, flexed the ply much more than normal conditions would do, tried scratching it and even beat it with a hammer and it held up great. Not sure what the rule of thumb is about painting over the bedliner material, but it seems to work, and overall I should end up saving quite a bit in cost of material depending on how many coats I end up with by going with the black ($69 a gal for the black vs. $140 a gal for the white)
Here are a couple of the updated pics of the side wall with the vinyl window temporarily attached;