LEGO NXT 2.0 Chainsaw Tank

I will show you how to make a cool nxt mindstorms 2.0 chainsaw tank!

Step 1: You Will Need:

Lego mindstorms nxt 2.0
time
pair of hands
brain
computer
usb cable from your nxt kit
the nxt software on your pc
internet

Step 2: Step 1

First build the multi bot from this website
nxtprograms.com/NXT2/multi-bot/vehicle/steps.html
then attach the tracks instead of the rubber wheels

Step 3: Step 2

Build half of the chainsaw from this website:
nxtprograms.com/power_saw/steps.html
Start from section 6
look carefully at the gearing ratio

Step 4: Step 3

Attach the chainsaw onto the body, you can do it anyway you want.
its easy

Step 5: Step 4

Put sensors on, such as the ultrasonic and the colour sensor.
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
                                                            left-Port b
chainsaw motor-port a

then you are done making the robot!

Step 6: Step 5

Programming. 
modify and use the shooterbot program
modify the move block on the top right corner to 10 or 20 rotations.

Step 7: Step 6

Connect your chainsaw tank to your computer with the usb cable, then click download!
you're done!
If you have any problems just comment below:)
thanks:)