In a previous life I used to build simple robots...
I'm amazed that it still goes, considering it's made mostly from recycled coat hangers. 
It took me about 2 or 3 months to make, mostly because I had to save up for the motors.
I got the general idea for it from a site called Robots.net, the robot itself is called a Carpet Monster.
The site has some really good pictures, but I still had to work out how the frame and the circuit went together. That took some time.
