Daniel K., a very close friend of mine got a new ski boat and needed video camera mount and tracker to follow the water skier while dragged behind the boat. There are such trackers you can buy for $300 but Daniel wanted to build it more than he actually needed it, so we did it. The whole project is made of machining grade Aluminum using my Sherline CNC Mill and Lathe and some manual work as well.
All the credit to Daniel, except for losing the photos we took at my workshop when we completed the work. The only one photo left is shown above.