There's 100 holes in that picture. That's 100 to correctly mark, drill & debur. In a former life I built control panels for industrial plants. Every button hole had to be hole-sawed, knocked out with a hole punch then notched for the button and label to line up properly. We used the punch for the final diameter because of the rough edge the holesaw left. Those panels were not nearly as thick as the channel used on the SS racks. Electrical panel manufacturers these days will plasma cut all of the holes for a nominal fee before the panel is shipped to you. The labor & cost savings is night & day.