Okay. more info...
I have confirmed that Stage 6 at Bridge Studios is now being used for SGU's Bridge set. Mallozzi indirectly confirmed it on his blog entry here:
http://josephmallozzi.wordpress.com/2010/04/20/april-20-2010-spoilers-chocolates-and-cake/
So, if Stage 3, 4, 5, 6 and the FX stage are being used for Stargate Universe, there are NO standing sets for Atlantis remaining at Bridge Studios to be used for any Atlantis movie and it also proves that the movie was never going to be made. Pre-release notes on what Brad was pitching is here:
http://www.answers.com/topic/stargate-universe
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From reading that, you can see how Brad even duped the studios with this show. What he delivered is SIGNIFICANTLY different from what was pitched. MORE LIES, but this time to the studio. Were these men (Mallozzi and Wright) raised by thieves and liars? I sure hope not...but they certainly know how to lie to studio execs and fans and steal from other shows.
The FX Stage, Stage 5 (where the SGC used to be) and Stage 6 where the Atlantis sets were are now being used for SGU...so, again...how was this alleged "planned Atlantis movie" going to get made? ANSWER: It was NEVER going to get made.
Originally, SGU was to be filmed in Stage 2, but at some point, the slightly smaller stages 5 and 6 (which are adjacent) were used instead. Stage 6 was occupied by the Atlantis sets. But Stage 2 is EMPTY which means that it was never used by SGU:
http://www.bridgestudios.com/stage2.html
The production notes scattered in the episode guides reveal much of the behind-the-scenes moves at the stages, as well as the development of the new SGU sets here:
http://stargate-sg1-solutions.com/wiki/Stargate_Universe:_Season_One By clicking any episode (start from Episode 1, Season 1), then Guide, then scrolling to the bottom, you can read the notes about the stages and what was being filmed on them.