I've seen those Boler pics before and admired the concept. A couple of brackets U-bolted or welded to the frame, some aluminium or PVC poles and a tarp with your choice of colors and sizes!
From rigging canopies over my Scamp
, I can tell you that the interior temps of the egg will be quite nice, even in direct sun, and the rig won't retain a lot of heat, so the night-time sleeping will be good! Also, the roof vents can be opened without the sun coming in!