See the problem is what you want really. The best way to do it would be to bust out the hammers, sandbag, and dollies, make a couple cuts and start forming the raised and lowered areas but it takes YEARS to learn how to get the smooth straight and even countours you want while expanding the metal to keep it from warping, and with the aluminum they may have to flame aneal it and that would make everything worse. I would bet most of the places doing it right now are either welding in louvered insert and smoothing it with filler or fiberglassing it.
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