Looking through an archive of the Official Site's GOUT vs DVD comparison, and I noticed this:

Not only did they use the same hallway for the SE shot of people wandering, but they used the SAME SE HALLWAY with the same buildings in the background.

vaderios, I think this is what Ady is looking for. Not new matte paintings (as he could do that himself), but entirely new CGI building like ILM created for this shot(s). Sadly they only created new 3D buildings for the bare minority of the shots:

And just "enhanced" them (ie, left them the same) in others:

It would be awesome if someone was able to recreate all the original matte paintings in 3D.