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I can see placing a piece of cardboard behind the wheel well and then spraying foam all on top of it till it fills out the space. Then you could simply shave/sand it down even with the body lines. Next pull it out of the wheel well while still attached to the carboard. After that, lay some fiberglass on top of it, trim, sand, paint, and then remove all the foam from the backside and you have a perfectly shaped skirt.
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