Download our flat bottom boat design for the extreme flats 20, a light weight, quiet hull with low freeboard. buy flats boat plans and more at bateau.com!. Power boats between 17 and 20′ loa. some with cabin.. 3] jérôme delaunay designs plans for simple cruising scows and pocket cruisers, with 3d building manual. (added: 28-dec-2015 hits: 227) my links | rate | cached |.