I also have questions about the Atrium...It can remain attached either to the saucer or the nacelles, I get that (though it did take me a minute). Does it have any drive capacity of its own? I presume it doesn't also have nacelles (but then, I assumed the saucer didn't either, a la Enterprise, so what do I know?). But does it have its own impulse engines? Can it move itself between the nacelles and the saucer if needed (would that ever be needed? Probably not...)#StarTrek #StarfleetAcademy