Epoxy Scratchbuilding-Experts(Chris) Pls Help Me

Hey how do i build a good air-scoop/intake on the engine hood with Milliput Standard Epoxy Putty? :uhoh:
Help would be very much appreciated.

For a pronounced intake, use pieces of plastic sheet as a cross section bone, and use it as a reference, and build a volume with putty, then carve and sand.