I got a handheld electric metal shear for 4mm ACP panel and a handheld electric concrete shear for thicker stuff...got to clamp a straight edge on the sheet to run a straight cut and it takes an 1/8" ribbon out of the center with each cut but it leaves a fairly nice slightly rounded "safe" edge to the ACP panel...it can also do curves....I havent tested it on coro though, I assume it would crush a bit....we could never get our Fletcher to cut ACP straight...
A hot wire cutter like they use for airplane foam would likely work better for coro...