The Observatory almost has a roof now and it works. Only the frame of it up so far, checking the distances between wheels etc.... Runs smooth in 99% of it's travel, a couple of little bumps here and there, where it goes off track a little, but this will be corrected once I get the side rollers on to keep it on track.
Here is a short animation of the roof opening and closing...
http://www.youtube.com/watch?v=av4Z67rj28g