That's how the ones where I worked were. Your build board brought back memories they had many of them like that on an oval conveyor, with each operator adding a few wires and taping or other duties. These were for GM cars and trucks. They also had some that were stationary for low volume specialty harnesses, known as "taxi harnesses" though they didn't go in taxi cabs. This was at GM Delphi Packard Electric, they made everything from the wire to the terminals, clips, connectors and even the tape.It would need to be sequential then. That is how the expensive testers work.