Re: Floor over gas and battery ?
All those holes are going to do is allow water to drain into the bilge, gasoline fumes are heavier that air which means they will sink to the bottom of the boat and the holes you drilled will not vent them. If you have any wiring connections under the deck (floor) there is a chance of a spark and then boom! You need a spark protected bilge blower and a vent connected to the blower somewhere above deck to get rid of any fumes that may be in the bilge. I saw a boat blow up because they had gas in the bilge, the owner turned the key to start the boat and boom. It can and does happen. You have a cheat fix available you should use it.
When you are up to your butt in alligators, it is hard to remember your intent was to drain the swamp. Stay focused!