Constant Camber Skirts
I've seen people put an awful lot of effort into making fender skirts to fit their wheelwell openings, often with awkward results. Why not just make a panel that overlaps on the body to a nice-looking place for a seam? You get shapes like sponsons, or that some 50s custom cars had. 4-doors will need a break at the door edge, but you can still carry the shape forward. The non-removable front bit is easy.
We have all seen plywood boats made by bending and twisting flat panels, and may have recognized some molded plywood ones, but few people know about Constant Camber panels. Those are sheets of plywood that are a bit concave to start with, and then get bent and twisted to a final shape that is much stronger and more graceful. One or two panel molds are enough for great versatility in design.
So - why not look for body parts like roof corners as possible sources of shapes for fender skirt bubbles? The steel can be cut from a junker with a sawzall, or you can mold either fiberglass or thermoplastic onto the shape.
I was noodling around with the idea of making a couple of molds, and having templates to trim skirts for various car models, but I'm not likely to get around to it myself.
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