I am in the same boat. I want to go with a fiberglass hood, but my kids want to eat food...
I want to buy a bolt on Hemi style fiberglass scoop. I found one where the flange turns back under instead of going out toward the edges of the hood. It is then pop riveted on from the underside of the hood and there's nothing showing on the outside. Everytime I've seen one where someone has tried to bondo on a scoop to a metal hood, it's always been cracked and looked like crap eventually.