roboticThe robot base is simple to build and can be
constructed out of a variety of materials; no special tools
are required. I’ll demonstrate a version made of expanded
PVC plastic, but you can use heavy cardboard, foam board,
picture frame mat board, or most any other material you
like. (For your convenience, you can get the robot chassis precut with all the hardware; see the Sources box for more information.)

 
Arduino Robotics | The Next Technology.