What about an extended MiniMig with a few (3) PCI slots on it and mATX form factor? Bang in a USB card and ethernet and an amiga-supported graphics card (Radeon PCI or Voodoo) and you'd have a nice little classic "productivity" system there.
'course you'd need a PCI controller solution and libraries, too, so this is probably impossible.
But! If you guys made one I'd buy it for sure
