I had a RFM and I can tell you the playfield was easy to pull almost completely out of the cabinet without disconnecting anything. You can slide it out and set the front edge on the ground, or just tip it up like a standard Williams/Bally/Stern. There were maybe 4 or 5 Molex connectors toward the back of the playfield to disconnect if you were going to swap it out with SWEP1. The playfield rails and cab mechs were all very solid and a dream to work on (not like some of the crappy designs you see on today's NIB pins). Its Achilles heel is the obsolete PC, proprietary video card (Prism). To make the swap you'd have to pull the PC chassis out of the head, pull out the Prism card, and swap something on that card. I never did it and I'm just going by what I remember reading about the process. I can't imagine doing it often and it's delicate work, not for anyone without prior PC building experience. Obviously Nucore would make the swap a lot easier. You could also build a dedicated PC for each playfield and just swap the whole chassis. I think it was a good idea but they chose the wrong hardware. Anytime you ask people to pull cards off a PC mobo and swap memory chips you are asking for trouble. Obviously Heighway's method is a hell of a lot better, but they have the advantage of better available technology too.