I would have thought the ally skin would be the easist. Personally I would go to a local sheet metalworker and get them to make up a simple sheet with a return lip at the bottom edge
Unfortunately the side of the car isn't straight so there would need to be a slight curve along the length (not fixed radius) and there is a diagonal kink near the front.
The side profile also starts vertical and then bends under at around 40 degrees before flattening across the bottom. This means the return lip would need to be about 5cm.
I think getting a flat plate to fit that would be possible with enough clamps to hold it in place while it stuck but to do this with a sheet with a deep return would be more difficult.
Also, P40 and sandpaper keeps the price down and hides the receipts from MrsWCA ;-)
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