Just a small reference as I see many of you search for ideas to make corugated steel:
its a tool used in barbershops to squeeze tubes of substances empty
I have seen something like this used for( makign corugated steel for a WW 1 diorama. Mainly, there are two types, made of plastic (not good) or made of metal (much better).
I can't immediately fidn a metal one but in case you are interested I suppose at least one AFV builder should have someone near that is a hairdresser