-probably Stern newer models-... uhhmm, why? theres a guy in Ebay that likes to salvage-convert machines into being coffeetables who might have some you'd want, or convert them for you. personally I like the suggestion putting them back to back down the centerline, or maybe one left one right alternating down the center. if theres not enough clearance to stand and play the space is really just too small for pinball machines.
if I were determined with the idea, time to put in a hip-gable extension to change the roof's pitch higher-flatter where a couple machines could go, like space for a big bed someone might want there years from now with enough room to walk down both sides of it, about 3 pinball machines widthwise. it'd probably cost less and work out much better than doing chop jobs on the machines. I'd say the "converted attic" wasnt quite converted enough.