If it's fiberglass, attachment points should be minimal.Take a look at a M&M car with the Reageal fiberglass body. They mount the body down from the shoulder hoop and once on each side of the front. Some guy's then tie them together under the bottom rails of the car not attatching to the chassis. The body needs to flex independantly of the chassis, or you will crack it up
Look at M&M Racecar website
Thanks
Mike