The car's connector hub, designed at the same time as the full vehicle harness. It exists to simplify wiring: sensor and actuator runs terminate here rather than being spliced into the loom along the chassis, so signals fan out from one place. The harness is mil-spec Tefzel, terminated in Deutsch DTM and Autosport connectors. This one got built, went on the car, and ran at competition.
The board is mostly there to tame the wiring. Sensor and actuator runs terminate at the hub instead of being spliced into the loom somewhere along the chassis, so every signal fans out from one place and a fault traces back to a connector rather than to a length of wire buried in the car. An LM2678 step-down regulator supplies 5 V at up to 5 A, but only ever for a DRS system: aero wanted the option, so I provisioned the rail for it. The production car didn't end up running DRS, so that rail went unused.
I built the harness alongside the board rather than after it, so the connector positions follow where the looms actually needed to leave instead of where they happened to fit on the layout. The wire is mil-spec Tefzel, terminated in Deutsch DTM and Autosport connectors, both of which lock positively and stay seated under vibration. A MoTeC PDM30 handles switched distribution on the car, and I set the hub up around what the PDM already protects so the two aren't duplicating each other.