Making a Mold?

[Smkn_TA]

Here is my problem, I have got a functional suncoast creations hood, and I want to have the polished stainless steal ram air grills. I bought some for the ws6 style hood and they are slightly larger, so they can be made to fit, but I need to grind them down using a template or mold of the car.

The grills on the hood are glued in from the back side, and the baffels block you from getting them. I have to get a template from the front side.

They look like this.
oooooo ____
___ ---xxxx ---______
/xxxxxxxxxxxxxxxxxxxxxx\
|xxxxxxxxxxxxxxxxxxxxxxx|
|xxxxxxxxxxxxxxxxxxxxxxx|
|xxxxxxx______xxxxxxxxx|
\___--- 00000 ---____/


They have rounded corners, and the bottom curves up, and top curves curves up, and they are kind of tilted to the side. I used a cardboard backing from a notebook, and spent three hours going back and fourth, I took mechanical aided drafting so I have all the neccessary tools to keep it all straight and even, but after a while I gave up, it was just to damn hard. I thought maybe if I get paper behind the grill, spray paint it, the marks that went through the grill would give me an outline to, but the bafels block you from doing that.

So what I need is a way to take a mold of the grill and a way to transplant that to a template.