I've had the same brainfart. I don't see any reason why they shouldn't work electrically, as they're both designed for a 16MHz 68030 CPU socket (rather than a PDS socket).
A very rough visual match between the one I have here and a loose SE/30 motherboard seemed to indicate that it would fit as is, if you trimmed off a part of the PCB that appears to have no traces or components. This is ignoring any case or internal drive collisions.
Say what? A 5 slot PPC Nubus machine? 8-o Is stealing the controller the only mod required? Apart from I assume installing two Nubus sockets.
