[NOTHING ELSE MATTERS]

Captpete, no disrespect to you or your work(is really amazing), but water eventualy WILL get there, even condesation. What i would do in your case now is i would drill some holes on the PVC tube just for the "in case water gets there" theory. When you make your cover for your gas tank you will have to install an inspection plate, maybe two of them, those things leak after a while. I would think it twice about no drains between bulkheads before i cover the floor.