I built this about a month ago and thought I'd share me design. It's a complete walkthrough, and step by step tutorial to get you rig going with less tha $200.
You can see pics of the rig here
https://m.facebook.com/story.php?story_fbid=2197928810438208&id=1449896668574763
You can see pics of the rig here
https://m.facebook.com/story.php?story_fbid=2197928810438208&id=1449896668574763