Adventures in soldering. I managed to more or less wire up the front and rear PSIs. This involved 18 leads to solder (including the LED daughter cards), and I am bad at soldering.
I used connectors for the wires going out to the LEDs, so I can disconnect them without having to take everything apart. I think these are the most likely point of failure, as they are already acting flaky. Hopefully I won't have to abandon them.