Whoohooo!
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Sega Naomi motherboard
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WWF Royal Rumble cartridge
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Capcom I/O
all from a seller on the CGCC.ca forums.
Gotta get some more carts, a new BIOS, and a netDIMM to get some netbooting figured out.
After this, the only arcade platform left for me to get is CPS3. That way I'll have followed Capcom through their great successes: CPS2 (Super SF2 Turbo), CPS3 (SF3 3rd Strike), Naomi (Capcom vs SNK 2).