This is the frame for my hammock-raft that was inspired by Little Big Town's song 'Pontoon'
It uses four 55 gallon drums for flotation which should provide about 400 lbs of flotation each.
The frame is 6' x 10', the gap that braces the barrels has an inner width of 16" and the two inner 10' boards have an inner width of 3.5" to facilitate a 4x4 post that will provide the hammock stand.