Is there still a walkway door on top of the Carrack that you can walk around on?

Yeah, the very old concept just had this singular door that came out of it and went around the bay, which you can still do. That's still there. You can still walk around the outside bit of it. It's not suggested, like walking around on top of a spaceship is never a supremely wise thing to do, especially if it's moving, but you can. There's now two doors, so you can get to either side of the hangar railings.