It looks like the holes are for the gun holster. No idea why they drilled into the cabinet through :-(
They are usually fitted as a replacement for one of the joysticks. How would they have powered both the gun and joysticks? Any wire cutting inside?
I got some instruction cards printed onto marquee type material, and replaced the clear perspex that sit over the cards. That will look good on yours
Very nice though Ully. Looks in better shape than mine