Steve is right, it is not easy to build. Especially the shoulder part is tricky and the wires on top of the brick are in the way for proper turning of the shoulders. The motor is btw only turning in one direction which works correct if built properly.
What I have done is bettering the construction. Use a longer beam at the back of the brick to get the complete shoulder / head / arms part two holes higher than original. Then stabilise the turning part by adding a 5 hole beam to it.
Perhaps you got an idea now what to change to make it work better. If not - sorry, I am bad in explaining things. What do I have to explain to get you understand the improvement? (Great sentence, isn't it? I am not a native english speaker - sorry).
A Happy new year to your family and yourself (and all others of course