Getting close to first engine-start. Fuel system is in, at least enough for now, the hoses stuck in a plastic gas container. Spark plugs were removed and the engine cranked until oil pressure came up. (It’s easy to tell when it does – cranking speed increases.) No leaks, that’s good.
Just started bringing up the various relays and found another omitted wire, a rather important one connecting power to the ECU, explaining why the ECU isn’t able to power-up any of the other relays… The Honda ECU comes up in stages, where one wire is driven to +12 V, then the ECU starts its power-up sequence, bringing up other circuits and relays, and that’s not happening. Probably because of that missing wire – I hope.