Figured out what the round holes with four notches are. Oiltight push button switches. Have no idea what the oiltight means. Feel free to mash the button with your oil covered fingers? All I know is that they run $150-$250 so I will NOT be filling the holes with them.
The dia of the circle is 7/8" which is standard 1/2" electrical fitting knockout. There are all sorts of things to fit a 7/8" aka 22mm hole. Push button switches and indicator lights in various colors, some with graphics or words like forward/reverse start/stop, on/off, an arrow that can face left, right, up, down. I found a 10 pack of gray hole plugs with threads and nut for $13. That'll work for now.
Face arrows down for closing the sides asap? Good looking switch, I will say.
Back panel insert for mounting components is supposed to be here Saturday. It's in Olathe, KS coming via USPS and if it doesn't get here until Mon, that's fine. Meanwhile I got the door cut out and touch screen mounted. I laid the components in there it looks like it will work. A drawing can be deceiving. "It worked on paper"