"Better look again. Both the 3/50 and 3/60 are Pizza Boxes. The 3/75 is
apparently a 2 VME Slot Pizza Box, now that sounds wierd!
"
I forgot about that one (mostly because the power supplies burned up a
lot in them..) They were "Carrera" (68020) CPU boards, with a VME SCSI
board in the second slot.
There are also a bunch of third party 6U VME Sun compatible CPU cards
that were made. Since the application for the system wasn't specified,
it's tough to suggest what type of system is appropriate.