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Fun to speculate but I'd say it's one of those "Don't Try This at Home" deals. I don't believe the issue is whether the boat will float or sink. It should remain afloat due to positive buoyancy provided by the foam. To me the question is more will it remain upright or capsize? Overloading any boat will decrease stability making it prone to turn turtle. Having a boat go over presents a real risk of injury to the crew. Leaving the plugs out to drain rain is fine, trying to overload the boat is another matter.