Ok...I may be wrong here...but.. (and sorry for the pics....all I could find...:) )
We see this view in one part of the film....OK.... Earlier on we see it from a different angle when Vader chokes Ozzle......OK
So the scene when Vader is talking to Palps via the holograme, it's quite obvious it's meant to be the same room, as we see Vader walk, then kneel down, and right behind him is his meditation chamber. But the holo chamber is huge...soooo.....