1) Unlike Shuttle they have deep cryo fuel on board, that they can potentially use for stuff like that. However that is my speculation. 2) Different diagrams h

1) Unlike Shuttle they have deep cryo fuel on board, that they can potentially use for stuff like that. However that is my speculation. 2) Different diagrams have shown it a bit differently. Usually they are shown coming out of the back of the rocket and then unfolding like a Peafowl. That's what probably those things between the Vac engines are. But this is just me guessing. 3) Yes, this should be very possible. There are so many new things possible its crazy. You could design a costume interior of the ship and launch that. Like a whole movie set and crew, or maybe almost like a sports stadium sort of thing for some new space boxing or whatever. But if we have more then 100 tons to Orbit, it should start to be possible to have pretty big LEO hotels/stations for much less cost.