Quoting Joonmin Kweon
Awesome build on this. I wish I also could join this competition but I don't have the set. Should I have the set to join? I quite don't understand the rules.
Great job on this!
Thank you for your opinion.
Yes, you have to use the 9398 as your chasis and the rest of the set to build the body.
If you don't have the set but you have all the parts needed to build the chasis, you still qualify to join the competition. The only parts that are new is the servo motor, the motor on the drive train and the IR receiver.
You can download the instructions and part list at the front page of the technic competition. (http://technic.us.lego.com/en-us/campaign/howtoenter/Default.aspx)