I used 2 free flats that was from construction workers in the area,,covered bottom with fabric to let water through,added the 2x4s--5 dollars for them for 2 boxes,,went to saw mill and got slats free--cut to lengthput 4 inches of soil--added 6 seed potatoes--will add second slats 6 more potatoes when 1 st potatoes come up--repete until you have 3 layers of potatoes at different levels--fertilize and water.average 125 to 150 lbs per box.i just do this to play around I have a large garden.will post pics of it!!!