I'm contemplating a non-Beetle architecture, and it has some similarities.
My thinking is that the underbody flow wants a flat diverter for minimal downforce, but there should be a bell-mouth to couple to the wake. You see those curved indentations in back bumpers to acclimate the consuming public to the idea.
So, a flat roof and curved outer fences with one or two inner fences. The outer fences can merge into a trailing spat, but I incline toward leaving that off to better shed snow and small mammals.
I want to airfoil the twist-beam rear axle.
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