Creating the control handles seemed fairly straightforward when following the tutorial, apart from at the end I did run into an issue when pairing the master rig to the other control handles. The right arm would go up at a strange angle. I think that this may have been an issue with the right arm control handle, and I seemed to sort out the problem by altering the rotation of the handle and freezing its transformations again.
Here I am weight painting the arm – I’m taking away the white parts which show the areas which will be influenced when it is moved, as on this character, the side of the ribs shouldn’t move with the arm.
Here’s a short video showing the movement of some of the new control handles.