Very interesting model and reactions. The particles emission for the smoke is great.
If I could sugest something:
- Change the key to go with the ship down to "sneak" instead "aux", is more intuitive as you use jump and sneak to use a ladder.
- You could make a formspec associated to right click to show some options, like to start the engine and go offboard the airship.
- An engine sound, when you make the start/stop function.
- Increase the time to make curves, to improve the immersion. And reduce the friction a bit :)