Update from June 11th-12th, 2011:
I think I understand now how the aluminum tubing is going to work. At first, I thought it would be really dreadful working on the west side of the floors in the rennovated building, since you would be behind aluminum bars and couldn't see the outside world. It would be like a prison. But seeing the frame, I think that the tubes will arc outward from the cladding in a south to west sweep, leaving just diffuse northern light coming it. In fact, if the inside wall of the tubes are reflective at all, there should still be plenty of natural light getting inside.