Radi0n said:

EDIT: wouldn't that mean that, even with the camera angle being below ground level, the chamber base would definitely be visible in the side shot?

This is what makes that bottom 'step' more likely to be not too far away from the same height of the smaller, circular prop, I'd say. Although it's hard to tell. It just remains to be seen if adywan thinks it should be slightly seen in the 'side onwards' shots where the distance between the props is concerned, though.

vaderios - I think I see what you mean now that I've clicked on the large image link I posted on the previous page. But, I think you're wrong if that's the case, as the detail on those wall 'pylons' is different all the way around. I just think this one is meant to be similar to the detail that we see on the one that is behind the very front of the Emperor hologram in this shot.