I will be doing the whole flooring of my 1975 16' Starcraft... but my question is that when i am finished with putting the new stingers in place (stingers are something like 1-2x8x14 and 2-2x6x10 green treated studs or something like that), i plan to foam the whole bottom with the 2 part closed cell 4lb foam... then cover the whole floor with 1/2 inch thick of green treated plywood and carpet it so forth... is this ok? i really don't care much on how responsive the boat is either... just gonna be a fishing boat... and the reason why i want to foam the whole bottom of my starcraft is that it probably helps stiffen/support the bottom portion of the boat so if my son ever hits some kind of rock it wont be wrecked that easily... This means that the hull will be filled with foam and no more open hole in the hull in the rear to let the water out... but i will make a hole above the floor so that if i decide to clean the floor... the water will exit thru that hole above the floor... i just what to know what you all think about this... if its okay to do or dont do it.... any answer is greatly appreciated...