+1plasma cutter.
+1 to lfe
But use lots of tape, the fall off will get under the pads and scratch the surface
The right blades make all the difference.
Mark bold lines, cut to the inside, take your time.
Some of us do not have the luxury of a water jet........
+1 again!
My shop guys do this method often and it's been the easiest for them.
So true about the blades, by far the most important part.
+1. Draw location on panel with Sharpie. Give machinist the cutout info sheets that come with HMI, handle, etc... send to water-jet cutter. ..