Here’s the windows that I have drilled in the port side half of the engineering hull. Some of the windows are rectangular, or should be. I’ve managed to get them vaguely that sort of shape as you can see. These holes, sorry, windows, were made by drilling initially with the small drill, then “joining up the dots” with my special window cutting tool.
Oh, all right, my special, ground down to the right profile, jewellers screwdriver, if you prefer!