I came across this today and thought some of you might be interested. There's a guy creating 1:1 scale models of ships from Star Trek with fully explorable interiors using the official deck plans. They're not perfect, although that's to be expected given Minecraft's blocky nature, and most of the rooms are empty, but all of the important areas are detailed. An incredible amount of work has gone into these and they really give a proper sense of just how massive these ships are, even a small ship like the Defiant feels like a giant 3D labyrinth.
All Atrocities' Ships
Sadly, there's no Galaxy class, but given the scale of that ship that would probably be asking for too much.