Home / boat plans & kits this directory includes all of the plans that are specifically designed for stitch and glue construction. garvey flats boat. Welcome to spira international home-built boat plans. spira international offers a wide 13′ western style drift boat; 14′ stitch and glue 15-18′ flats boat;. Boatbuilding with stitch and glue plywood fast-g the planking is assembled flat on the ground. then the boat is folded together to form the vee bottom hull..