Basic modelling question

Hi this is a pretty basic question, but i havent done this before. Im making a small plane. I want the door to be able to open and the propeller to spin. How do i do this? Instinct tells me to make the plane body, the propeller and the door 3 separate meshes and then put tthem inside a actor in Unreal. or is there a better way of doing this?

That’s the best way. You could make it one skeletal mesh and rig it with bones, but dealing with a door and propeller within UE4 is probably the way to go.