This was one of my favorite rooms to draw...lots of stuff here. I won't promise accuracy because I had no closeups of the panels above the councils, nor of the councils themselves. So I faked it...artistic license. I basically did it to try and convey SPACE...the emensness of the room. The rid over the tunnel was tricky, but I found a way to do it without using the pen tool. I exported at a large size due to the detail involved.
Oh, and I took the advice of the comment below and put the rail in front of the stairs. It was really stupid where I had it.