Gameplan used connectors for all the wiring between head and cabinet so the head came completely off. Sounds great but the connectors are sometimes a real PITA to get apart and all those pins added another layer of unreliability. That is a lot of pins to replace when you get a non-working game.
That is one good thing that Stern did was to make their backboxes fit thru a 28" door. Thank you Stern.