Mike develops scantlings using the same empirical method favored by his Uncle Tommy. "I prefer to rely on proven results, things that have worked for us in the past, rather than theory," said Mike. Persistence's bottom is cold-molded 5/16-inch Philippine mahogany- four layers on the bottom and three on the topsides. A laminated mahogany keel, stringers, and marine plywood bulkheads support the hull shell. Her deckhouse is built with tongue-and-groove mahogany and her foredeck with marine plywood. Exterior surfaces are covered with a fiberglass and epoxy laminate that is faired and coated with urethane. The result is a strong, relatively light structure. All up, with fuel, tower, and owner's gear, she weighs in at 118,000 pounds.