I promised I would do the assembly video with my son. So I am...
I will make that happen this weekend.
The good news while I've been waiting for him, I've made progress on the PnP head so I can use the ficidual camera for calibrating the printer now. That should allow me to detect anomalies I wouldn't have been able to before (like how far off my guesstimated virtual pulley shape really is).
In the meantime here is a most epic David Bowie reference.