I wasn't trying to offend folks.

I was just saying that for those that are using the cardboard as their PERM solution to a shroud.
Tin-Snips are usually no more than a good ~$10 and cut just about any medium to thin steel. I used a cardboard cut-out, made some drawings on the sheetmetal with perm marker, cut out the shape. Did the angle bending with a block of wood and clamps then brazed the sides with silver-flow soldering. Then cleaned up the flux with some paint thinner, and don't forget to DEBURR the cuts, them things are SHARP!

Good luck!
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