About the "meditation and hologram room" controversy:

First of all, we have to know that "both" rooms were the same studio 5 set at Elstree. It's not hard to realise that half of the room was the meditation chamber and the other half the hologram room, because in both scenes we only see half of the set each time (meditation room has the screen and the door, and hologram room has the pylons and the tubes; of course, they moved in and out Vader's chamber as required).

Another thing is where the officers stand (which is not at 6 from the screen, but about 5) and where they were really shot for close-ups. Below you can see how Veers' close-up shot is in fact taken between the tubes on the right of the screen and the left-hand side door pylon (I'll come to this in my next post).

NOTE: green and red mark coincident areas