The circled area is where the body harness will come through. I've been working on the Heater core hose tuck in parallel with the wiring. Here is my hose routing from the cowl around to the water pump. Eventually I'll add AC, so I'm making sure to leave room for routing those hoses. The hose fittings are all aeroquip socketless -10 AN and the tube ends are -10 an male - 5/8" tube compression fittings.