I want to build a Ford Tri-motor and was stumped on how to make the corrugated siding used on this, and planes like the Ju-52. There were others I learned who had made various machines, and one fellow said to look at a paper crimper, thought it might work. Got one on eBay for $11 shipped. I'm using .002 hardened aluminum, 6" wide, from McMasters, works like a breeze. If you're a purist, the scale might be off, but......

What's a paper crimper used for in real life?

Scrapbooking...............! Beyond that, I haven't a clue. Bill