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CNC laser would do the trick.
since I doubt you have one of those handy...a dremel with fiber reinforced cutoff wheels.
definitely get reinforced cutoff wheels or you will spend all day putting on new wheels. the non-reinforced wheels will often only cut about 1" to 1 1/2" of sheet metal (dependant on thickness of course) before they are worn down to nothing.
the reinforced wheels will make it through at least a 12" long cut with no problem. of course, this depends on the thickness of the sheet metal, etc.
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carpe noctem.
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