Are all Playfields the same apart from the artwork?
They are pretty much the same. there are rollover buttons that advance certain features that are not common to all games.
Here's the boxes of spares that were in the room ;
In the garage at Dad's place, there are original legs, balls, playfield parts, original backglasses and reproductions. I have boxes full or original coils and new coils wound by Dad in the 60's. Some amazing stuff.
Thanks to all for the positive comments. It has been a great adventure that was more of an emotional experience than anything else. I'm relieved to have the machines as well !