I'd use a Scotchman Industries hydraulic metal shear. Their littlest machine, the 45 ton, would do it easy enough, it's rated to shear 3/8 by 6" bar stock! Heck, their specialty tool shop would make a set of dies so that you could punch them outa sheetstock! And if you still got money left over, they got a guy that used to work for them that could take their hydraulic ironworker and build an automated system to run it. All you'd have to do is load the pallet of sheet steel on the machine and hit the ON button. It would automatically feed and punch away while you drank coffee and polished your fingernails. The ironworker would cost you around $12,000. Jeff would build the one-off CNC automated system for about $75,000.
The saw is probably cheaper and more likely faster production than using cut off wheels on a dremel. Plus it's less likely to overheat and ruin the tenper of the cutting edges.
