Haha, it's true what you say about the AT-AT. I really just kind of rushed that shot, but it'd be ideal to actually have a close-up of the doors opening or something to add more clarity.
Mithrandir,
For Vader walking between the pillars, it might be awesome to see him force-blast the obstacles like he does to that poor door on Kamino in The Force Unleashed II.
http://www.youtube.com/watch?v=jAiFRMcKGf0
(at 5:08)