To facilitate measuring to the centers of things, I designed and printed these widgets - it's not apparent from this screengrab, but they have dimples at the centers, and in the case of the dogbone-shaped one, a groove along its length, so I can get a caliper into it. This allowed me to get everything adjusted.
And here's both arms on the car. Between them, there will be the steering knuckle, which will hold the hub and the brakes, and also a coilover shock. Those are next steps.