It's not that big or heavy. heck it's only a 2 player game! the 4 player variants are the heavy ones. cabinet is repainted (unfortunately). but hey you bought it because of the theme, i get that.
It's a single bit lock. just drill it. take a 1/4" drill bit, and go right down the center. It will break off the bolt/tab (if you go straight.) even if you're off just a bit, a small pry will knock the lock tab right off.
Personally i just do the pry and for-go the drill method. The drill method leaves lots of metal bits on your floor. so best to put down some newspaper or a trash can to catch it.
On Gottlieb's in this era there's a metal plate that protects the wood frame just behind the coin door. that's why i usually just use the pry method. But if you've never done that before, drilling is certainly safer and easier on your constitution.
If you do the pry method though, the advantage is you can remove the lock tumblers, and re-use the lock. After the tumblers are removed, and some adjustment to the lock tab, any flat head screwdriver or spare key will work in the lock. Saves having to buy a new lock and also saves future frustration when you can't find a key!
If you need help on the pinball feel free to email me directly.
cfh@provide.net
or you can read up on my repair website at
http://www.pinrepair.com/em/index1.htm