Design comes along as I go :-)
Found out that the small ducting could be used for cooling duct for the brakes.
Needed something square'ish to round tubes.
Used some plastic soda bottles, cut then in half and used the top section.
Stuck then on a 2/4, to create a mold.
An old rear shock, was used as a mold for the round tube :-)
Then some more cutting and trial fitting.
Brake air duct completed
Finally getting closer to where I want to be...