i'm not sure if this will help, but, have you tryed your local library?
i'm not sure about anywhere else in the world, but our library system in columbus has every non-roleplaying star wars book ever published. that includes all of the 'Art of...' movie books, which might help if that floorplan was ever designed in concept art. they also have all of droid, race, planet, technology, etc. books that have been released.