After many months of absence, I had the energy to pick up this course again. So here’s my version of the ‘CubeDude’ rigged and modelled.
I find the rotation constrains, difficult to do. There’s no visual feedback on the parameters, other that trail and error.
So the ‘CubeDude’ in three poses; rest, start sprinting and marching.
In the last example you’ll see horrible mesh in the right arm. Due to low (minimal) mesh data. Could be slightly improved, using the option to keep mesh volume intact. But I couldn’t find it any more.