Long time no see, it has been at least a month since the previous plane or boat. AT LAST! The third boat has finish. Try to built as big as I can, did my biggest effort to build this giant monster (at least it's big to me so far), and its partcount has bring down the fluency of my computer. Will, the boat's function were OK after the test, hope you guys enjoy.
1>Turn-on or Shut-down the engine;
2>Engine rotation;
3>Cabine door (Trim for the elevator platform);
4>Missile cabine's door & the watchtower machinegun (trim for rising height);
5>Rocket pot on the left;
6>Rocket pot on the right.
7>Main gate.
Use Yaw to control the direction

Credit: https://www.simpleplanes.com/a/X20Zq5/X-3