Goose...
I have been looking at lot of simple and sensible set ups for ducting air through the radiator but being a simple yet un-sensible person, I decided to build my own.
The fuel tank acts as the duct for the exit under the car (this may change), the vertical panel seals to the tank. The radiator drops down into the pan, is located by the pins on the bottom of the radiator and leans back into the diagonal panel. Air entering the front of the car and should be pushed through the radiator.
I finished the chassis leg too, tied it into the I-beam cross brace. I think it will work.