Very nice writeup. I too would be interested in routing the hose to the brakes. I have been told by more than one race shop that when doing ducting for any car, they only recommend routing air to the center of the rotor, so that it can blow from the inside out through the cooling vanes. Blowing air directly on the inside of the rotor will result in only that side being cooler, which puts uneven heat/stress on both rotors and pads.
Here is one example of a kit for BMW M3:
Turner Motorsport - Item# TMSBRAKE46 - TMS E46 Racing Brake Duct Kit - E46
I wonder if there is enough room to come up with a similar solution for the 370Z?