Well, your hinge should give you a pretty good guide for the layout of the bolt holes and the new stamping should have a pretty faithful reproduction of the idented area. The reinforcement is a flat piece of heavy gauge metal that is bent in a big rectangle around the area. by the sound of it, your lower cowl must be still there, otherwise it would be visible.
In the links section, there is one to Chuck the Truck,s website and there are some good closeups of his work in this area.
