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I imagine bodies are made of .030 - .045 3003 H3. It works well, yet has some basic starch to it for stiffness.[/quote]
I believe Original cars were made of .050 for the body. The thinner the material you use the more experience you will need to metal finish the body. You will end up putting holes in it and thin it too much as you shape It and try to metal finish the welds ect. Now days most will use .060 3003 h14. This thickness will give a little cushion for metal finishing and stretching for metal shaping. It also welds well using a strip of parent metal with O/A or tig. O/A is the preferred method of welding aluminum bodies. The guys that can only tig weld will argue this.
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