The link hardware (an Intel i8251 clone) isn't implemented. There is i8251 emulation in mame but idk how it can be hooked up for ssf2tb.
The network topology looks similar to ring, with cabinet 4's out port not used and cabinet 1's in port using a mini din cable with pins 3 and 4 bridged, but it doesn't seem to be the case. From an electrical standpoint, this deserves an explanation (and smells a bit like RS485).
Speak of RS485, that is also a concern to me because that style of network topology was never attempted (besides an experimental V-Unit network build which cheated by running all the emulated pcbs as one instance). The Konami games were also known for using RS485 to network more than two pcbs.
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