Step 1: You will need:
pair of hands
usb cable from your nxt kit
the nxt software on your pc
Step 2: Step 1
then attach the tracks instead of the rubber wheels
Step 3: Step 2
Start from section 6
look carefully at the gearing ratio
Step 5: Step 4
link up all the wires into the correct position.
Ultrasonic sensor-port 4
Colour sensor -port 3
steering motors(from front view) right-Port c
chainsaw motor-port a
then you are done making the robot!
Step 6: Step 5
modify and use the shooterbot program
modify the move block on the top right corner to 10 or 20 rotations.
Step 7: Step 6
If you have any problems just comment below:)