My apologies, that was a typo on my part, I did mean camber!
If everything is set in stone as you say, then you are going to have a problem with this no matter how you solve the Inventor dilema.
I wish I could help more but my knowledge of Inventor is somewhat lacking.
Attach your assembly here.
I can't seem to remember where that project lives on the server and my memory of it is foggy. I think I resorted to a brute force method of constraining each one individually to individually created work points.
I zipped these files and for some reason it blew out to 18Mb, so when I've posted again I've forgotten the words, see below.
Here is the assembly, I've got it working (took a bit of working out the math, but got there, simple in the end)
But I've got a new problem.
When I'm detailing the flat pattern, I can't select any of the holes that finish up on a folded/rolled part, even though they were modeled before any folding.
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