*all images may include upgraded options* 20’4″x66″ sled starting at $29,995.00! including 115 evinrude e-tec pump and tille. our 20′ 4″ flat bottom sled is. Full exterior paint; silver hammertone semi gloss powder coat; front level floor; all aluminum diamond plate floors; self-draining fish box; includes 2 seat boxes and. Specmar aluminum catamaran hulls are either symmetrical or asymmetrical in design. a symmetrical hull consists of two basic v-bottom hull structures..