I recall kne of the tanks on an old classic sports car had a lot of detail embossed on the flatter section to stiffen it. Sounds similar to what you are talking about although this tank was riveted and soldered. It was steel. But large flat sections are probably not desirable.
https://www.tinmantech.com/assets/im...rdFuelTank.JPG
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Scott in Montreal
Last edited by sblack; 12-30-2019 at 02:26 PM.
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