"coolwater" – a $70 shanty boat!! well, maybe it might cost a little more in today’s money. these plans even detail how to make a built in wooden bilge pump!. Free boat plans for the backyard home builder, plywood and wooden sailboats, rowboats, dinghies motorboats. 20′ trailerable outboard shanty boat. both arrangements sleep 3-4 with room left over, have a complete galley and small head with composting toilet. solar panels, a.