Rob, both scoops have two ducts. I suppose one of the ducts could be used for cooling of the brakes, but I'm not sure airflow is effective enough along the sidescoops.
I do have seperate scoops they designed that sits underneath the car and direct air to the rear brakes. Same principle as the original Gr4 cars, but different design.
I've started on my aluminum doorskin project - just like the Gr4 cars had. Started on the driver side door by pulling the steel doorskin of a perfectly fine and rustfree door !! :-).