Theres nothing wrong with fiberglass. I am not sure how the Cervani hoods come, but if they are not primed you will need to use a polyester(high build) primer to fill in the little voids. If they already come ready to paint you or whoever paints it, may have to sand a little.

Most of your custom parts are going to be fiberglass. Norms Fiberglass is a prime example. http://www.normsfiberglass.com/

I get people who have Norm send me the parts directly to dip.