I originally built this robot for "NXTasy.org Challenge #5: DragRacers". It has an exptremely sturdy design, and two coupled motors for extra power. It is geared up for speed, and has all the design elements of a standard drag racer. It is roughly 22 and a half inces long, and can go pretty fast. After it won the challenge, I took it apart to build BrickBot v1.
The motor and sensor ports are easy to access, and the brick is fairly easy to remove in order to change batteries.