I wondered, cause I used metal foil tape in a similar way years ago when my hatch was gettin' pretty bad.
If I wasn't replacing the whole side with a new panel then yes, I would probably make a template out of plywood, notch the metal's extra 1/2" of lip every 3" or so, and then bend the lip down over the template with a body hammer. Then I'd cut a 1/2" strip of metal and bend it around the radius on the topside of the lip, then weld it from the bottomside at each notch and grind smooth. And if your really confident of your welding you could just omit the lip and notching, cut the strip for the lip and then weld them together to form the bend of the lip.
I'm going that direction only because I'd think the metal, and I'm thinking 18 ga., wouldn't bend so easily with a hammer and wood backer without making a lot of waves and divits in the panel. And heat would probably warp it. But I would surely try it first to see. Notching it gives you shorter sections (more straight) that are easier to bend 90 deg than to bend 90degrees plus a radius that will fight you.
I'm thinking someone repaired their sides with metal but I don't recall who at the moment, and now it will bug me so I'll find it for you if I can. After a while all these builds can blend together!
The end of a defining era.... JEEP R.I.P. 1941-1986
My frame off Re-Build: (the 4 year saga....)
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