I've now started to sculpt and add detail to the figure. All the actions work but it is clear that although I've learnt a lot about making mechanisms the final piece just doesn't have enough movement to make it interesting. At the very least the cogs in his back should move. Also I'm not happy with the the head movement.
Another day or so should see him complete. He will look nice static anyway!
I also now have more inspiration for another (static) old man figure with a mechanical back.