Nice job Mike. I actually kind of like the 3 ribs on top.
FYI, when you have to wrap a curve like that, see if your supplier carries wiggle wood. It's a 1/4" plywood, but all the layers are oriented the same direction so it can roll up to something like a 4" diameter circle. Extremely useful, and you don't end up with those little curling edges that are always trying to straighten them selves like regular ply does.