Well Darren thats part of it. yes you will need the chassis because the hole moved. Then you have to have the new chassis deck mounts for the deck and servos becaues the holes for those have moved and the servos are moved rearward. If you don't move the servos rearward the steering bellcrank will crash into the side of the servo case. (its not a trim it and it will work) Then you need the new upper carbon deck to match the new deck mounts. you need the new battery and reciever tray because the new chassis eliminates the old place to mount the reciever so you have to move to the new location. since all that moved the rear side braces got shorter and are different so you need those.
So you need everything Darren mentioned and what I mentioned to do the minimal job. This is the delimma of the upgrade kit.