Specmar aluminum catamaran hulls are either symmetrical or asymmetrical in design. a symmetrical hull consists of two basic v-bottom hull structures.. Save $1000s by building your dream boat with only a few tools and a little sweat equity. we are your one stop shop for customizable aluminum boat kits.. Designed for the dedicated skinny water sight fisher, this flats stalker boat plan is durable and easy to build. get the small flats plan at bateau..