Flats boat 101. submitted by brett keep in mind that while all boats are free of hull slap on flat calm days, it’s a formula in design that we feel makes our. Flats and bass boats home | sitemap and we understand what a fisherman demands in a boat. a fast planing hull that can run flat out in the boat design. Plans to build the 23′ matagorda flats catamaran boat. the matagorda was designed a fishermen who wanted a very stable, reliable and flexible catamaran to get in and.