I was part of a group from the University of Minnesota that traveled to Chippewa Falls to tour the Cray plant. I expected to see exactly what you describe, the computer behind a big observation window. But instead they took us to a machine that was undergoing final testing before delivery, I think it was serial #5. They were extremely proud of their cooling and invited us to put our hands on the panels in the opening of the C to see how cool it was. I still freak out over thinking about what would have happened if someone had tripped and fallen into all those wires on the inside.