I don't know why I tried servo's first but I am not sure if servo's can make precise angle reproduction... it follows your pots' movement very well but can you make it move 59,5 degrees if your turn your pot 59,5 degrees??
If you are looking for smooth .5 deg control resolution using your head, I doubt it will happen. I made a simple joystick control for my servo based webcam pan/tilt and learned a lot. You could get a pair of plastic safety glasses and attach a laser pointer to see how well you can make the laser dot stay on target. What do you do if you need to move your head without moving the cam? If you manage that, how do you get the cam and head controller back in sync? I'd do some simple proof of concept testing before starting to invest serious $$$.