+1 on just cleaning pin and replacing rubbers and broken flipper mechs. Personally I wouldn't care less about a cab drill hole here and there. Putting on cab decals is really not worth the hassle and you're gonna have another pin next to this one fairly soon anyway, and then you can't see the sides of the cab anyway, right
You could remove everything on playfield and clean individually and clean playfield with a cloth and novus 2 and wax the playfield (proper silicone free carnauba wax). This is a great introduction for you to get to know the pin and its parts and how things work and are connected. Don't forget to keep all parts you remove organized and take photos along the way so it's easy to reassemble.
Air pressure blow the underside of the playfield, especially inserts. Preferably outdoors if you can because you'll potentially have a big dirty dust cloud forming and you dont want that in your house.

And replace those flipper bats with the sligthly shorter lightning flippers that are the standard on fish tales.