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One way is use cardstock and create a profile curve which takes a lot of trial and error cutting. Similar but uses a profile gauge. This is a holder with a bunch of wires that is fitted over a surface, then traced onto sheet metal, paper. Some hardware stores might carry it or a automotive paint and body shop store. I think Michael's craft stores used to carry them also. I had a really nice one that I got from a metal fabrication supply years ago that unfortunately got stolen. It was sort of overkill for most model work, but I used to do some auto restoration work and it was great for that.
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