[myself248]

Nor powered up at all stages of assembly.

I didn't spend a ton of time at the plant, but there was one notable visit where I got to camp out at the station where, for the first time, a 12-volt power supply alongside the assembly line would be temporarily patched into the half-completed vehicle. This allowed all the modules that'd been added so far, to boot up and do some self-checks. There were certain missing sensors and communication errors that were expected at that point and would be ignored, but plenty of errors that _would_ be raised so they could be fixed while they were still easy-ish to reach, before the seats and trim panels started going in.