[geoschmo]

To be honest though there really is no reason to keep the sets. They are mostly wood and paper and paint. Those things aren't exactly built to be durable. They are built to look a certain way on film. Sets get damaged and rebuilt all the time during filming precisely because they are so fragile. Storing them would be difficult and unnecesary. And they would look like crap after a while in storage anyway and wouldn't be usable for anything. They can be recreated from photographic records which can be stored much more easily and permanently. They are doing just that this season in the episode about the Terran Empire. They rebuilt the Constitution class (TOS Enterprise was a constitution class) bridge of the U.S.S Defiant from the TOS. From the photos I've seen it looks great. Just like the original.