No way you'll get me to store a couple of gallons of water forward of the head area! And I don't think I agree with your estimate of the size of the tank-I figure the tank is (at the top) about 3' wide aft, 1' wide forward, and about 3' long. That would be a top surface area of a little over 5 square feet. So conservatively, figure 5 cubic feet of volume (the tank is deeper than one foot, but tapers quite a bit). A gallon of water occupies .1337 cu. ft, so I would estimate 5/.1337=37 gallons.
I can't believe I just wasted so much time on...waste.
