*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. These aluminum landing craft designs (plans) come in a variety of sizes for multiple purposes. the aluminum landing craft are ruggedly designed to withstand frequent. Flat bottom scow-type boat fishermen who like to work the shallow backwaters and weed patches on lakes and rivers will find this flat-bot-tom scow-type boat an ideal.