Some more tinkering on the NOS Formula hood today.
I used a Dremel tool and a file wrapped in sandpaper to reproduce the factory cut outs in the scoops. I formed the rounded edges on both ends by using a Chevy fuel pump push rod wrapped in sandpaper. It was a perfect fit for doing the curved edge areas. It was very difficult to keep the same 1/8" inner edge as the original. The reason is that there are molded-in decorative grates in the scoop area that you have to transect. Some of the edges of the grates remain and some have to go, to maintain a consistent permimeter on the curved inner surface.
Here is the original Ram Air hood cut outs. The metal grates slide into a slot from the underside of the hood and are held in place by two screws.
And here is my version on the NOS hood:
