Enopia: Autobus.

     Autonomous buses are a common sight in Enopia, especially in the more populated areas. They travel underwater, and can even withstand sea serpent attacks. 

     This model has two gullwing doors, seating for fourteen minifigures (not included). The entire top of the cabin is connected by eight technic pins (not sure about lifting it off though).

     sorry, I'm not very good at writing or speaking. That's not how I think. And I already forgot what the product guidelines were.