The outer rockers were actually installed over the edge of the body versus bolted under the body as in most other kits.  This provides a very clean and secure look.  Braces were installed on the chassis to support the weight when a person steps or sits on the rockers. 1/4" self-locking clips with flat-heads screws secure the rockers to the body.  In front of the rear wheel, the rocker was fastened to a brace from the chassis.  The rocker and fender had to be pulled out a couple of inches to ensure a natural curve versus an inward bend of the fiberglass fender. A piece of tubular steel was used all along the rear of the rocker to provide strength when connecting the rocker to the body (see 3rd pic below).