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. No plans, i just made it up as i went along. scratch built mostly from stuff i already had in my garage. so-far it doesn’t leak! next is to find a motor for it. Alumacraft the alumacraft 12′ flat-bottom jon boat features 4 extruded aluminum ribs and pressed-in chines for strength and great tracking. alumacraft 12′ flat-bottom.