Nope, you'd be soldering the SIMMs to an adapter PCB soldered/socketed directly to the MoBo, nestled between the remaining ribs of the intact bottom surfaced case.
Who said anything about not using a ROM SIMM, just move that to the adapter to make room for most of the wires, it sits on part of the same address/data/control line bus as the RAM, with a few ROM specific signals added, IIRC. Voila! Holes to spare! [}
] ]'>I hope he decides to get involved in this as well, I'm working out the funneling issues for using inexpensive 72-pin SIMMs already, albeit v-e-r-y slowly! :
?