Dunno. I suppose someone with decent CAD/CNC milling experience could take quite a bit of the cost away from this. You could probably recreate any board with a standard 6-axis machine with at least a 10ft x 8ft work area.
Most of the cost would be incurred from trying to reproduce the unique items like bumper caps and plastic overlays. After reproducing the playfield artwork, of course.
Hmm. Maybe it's time to start rehashing those old 1990s skills.