Once upon a time I decided I'd like to build a 28 foot wooden sailboat. Nice sturdy one at that. I'd already built a couple of small boats (and they didn't sink!) but this one was going to be quite a different story. The keel was to be cut from 9 inch thick oak. Now, 9 inch thick oak is not something one tosses around the workshop casually. So I started by buying a humongous bandsaw that stood 7 feet high weighed 1000 pounds, and had a cutting height limit of 19 inches.
The point of all this is that there are bandsaws around that will cut a roll of pretty much any diameter and there is probably one in a woodworker's shop not too far from you. Far safer than using a table saw, cuts cleaner, less waste, etc etc.
But maybe even better than vertical bandsaw would be an angled metal cutting saw. Like these.
https://www.amazon.com/Metal-Bandsaw/s?k=Metal+Bandsaw
If the roll is under 5 - 6 inches thick you can probably get one with base for not so mucho dinero and sell it on ebay when you're done - or keep it for next time. If you haven't worked with one of these, they're very safe, cut a thin kerf, and work by twisting the bandsaw blade so the length of the cutoff isn't limited. If the roll is thicker, and decent metal fabricator in the area will have one with greater capacity.
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