Just look at the video
Now that it's done you understand why I wan one of these i started the project to build one a bit of time ago already
Using one of these micro controller as brain http://www.arduino.cc/
The rest of the part came from this site http://hobbyking.com/hobbyking/store/uh_index.asp (if you wanna do the same avoid ordering part that are back ordered they seem to never come by or being reimbursed)
All I'm missing is a frame to get started.