Parts List:

• Brick 2 x 8 (2)
• Electric Technic Mini-Motor 9v (2)
• Plate 1 x 2 with Door Rail (4)
• Technic Brick 1 x 4 (4)

Notes:

• Although you may have a hard time seeing it, the back side of the model looks exactly like the front; what you do to the front gets done to the back as well.
• Those free-floating 2 x 8 bricks are at the same level as the motors.  Remember that, because they will go underneath some plates in Step 5.
• Piece clarifications:
•     Electric Technic Mini-Motor 9v: This is the motor that came in your Mindstorms set.
•     Plate 1 x 2 with Door Rail: This is the 1 x 2 plate that has that extra length on the side of it.  If you notice, that extra length fits right into the notch on the motor.  Anytime you see this piece in these instructions, assume that it will go with the motor.