It is done:
Me pointing at my friend who came in first place in a race. His head looking towards me, while he stretches his legs, and poses towards the audience.
Summary: Arms, elbows, hips and knees can move in one dimension, while the neck can turn 180 degrees facing left to right.
I’m going to update the GitHub repository so that there’s instructions on how to use this. I’m not going to work on this anymore because I’m moving on.
Thoughts? Comments?