Finally finished this project. Discarded RIB hull with stitch and glue 6 mm okume air chambers. Deck and sides are air chambers with raised transome for long shaft 14 hp. Exercise mat makes for comfortable entry and exit. Can fill inside with water and engine is above water line allowing water to flow out when under way. Extremely stable in full throttle turns . Handled 3-5 seas but beat my old bones to death. Speed is much more than I anticipated and gets airborne in big chop.
I really like the way it turned out but wish I could have found a 12 ft hull. Total cost of materials were under $500.