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JulianEdgar is the guy with the bead-roller. That was directed to him.
In the video the [nylon] hammer to upset the metal is trivial compared with the planishing hammer.
Simple curves are... simpler. For a compound curve shape, flat sheets with curved edges and curved ribbons for the corners could be finessed together. I think the long ribbons would taper at the ends. Maybe contrarywise. They could be rectangular strips with rivet holes in curves.
The advantage of a material like Polymetal is it's pre-finished. For the final iteration, maybe Polymetal flats and aluminum flashing rolled for the edges?
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