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!. Manufacturer of shallow water, catamaran flats boat with hand laminated fiberglass hull, patented catamaran design, and self bailing. located in rosenberg, texas.. Drift boat plans free shipping to us & ak • $30 shipping to canada • please use the "contact us" page for ordering or.