As described this seems like it would be really difficult to implement. Why not a kinect peripheral that tracks a networked hair trimmer. Depending on the posi

As described this seems like it would be really difficult to implement. Why not a kinect peripheral that tracks a networked hair trimmer. Depending on the position of the trimmer, it turns on/off to avoid overcutting. I cut my own hair sometimes with an adjustable trimmer, and the hardest part is getting the length right at the back of your head.