Well, that's the easy part and I had already tried that before I read your reply...hehehe
It's the concavity of the plane or cube's faces and corners that I'm having troubles with. This is the part where no matter what I try tends to not work. The thickness of each flattened cube needs to be thinner in the middle as it's curving. Look at the second reference I gave to see what I mean.
Extruding the ends of the cubes, adjusting the position/scaling, then adjusting the same on select vertices sort of worked for the corners but it looked more like a wingtip on an old F-4-U Corsair (i.e., planes in the old Black Sheep Squadron tv show). There has to be an easy way to simply make the faces concave....maybe making one cube, flattened, somehow making it concave, adjusting the thickness in the center of the side face, then duplicating and rotating 3 times to form the roof.
Man...if anything, I'm getting quicker starting from scratch each time.