The elevator servo was in a tray and off center. I used a fiberglass arrow shaft for elevator and rudder push rods. The exhause extension was a thin wall silicon tube that attached to the end of the pipe stinger and went between the pushrods. Did not use the PP. When I started it looked really tight, but as it went along, everything fell into place and worked quite well. If you need a sketch of the upped deck attachment method, let me know.