All,
The ducting of air to the brakes the modern way is one reason why I upgraded the front suspension to include the '99 Lola Indy uprights. Here is a picture from the front showing the air duct coming though the middle of the upright and feeding cold are to the inside of the rotor.
Here is a view from the back showing the sheet metal work and the brake duct mounts.
Of course the added benefit of being pin drive helps with the conversion to 6 pin drive wheels.