Wiring up the gearbox chassis
Now that I had a set of 4 at least minimally working lateral servos, I needed to wire up the chassis so that everything had power and data. Here are some pictures of that process:

Two legs installed

Four legs installed

Joint cable routing

Times four

Suspended from the test fixture

Four sets of busbars, the junction board, and a shore power battery simulator
Next up is making it do something!