Douglas, I am sure you are right on all counts but a modular sealed flotation "bulkhead" that is designed to fit in the unused spaces could be easily designed and installed. It would not have to be part of the rotomolding process but rather a piece that gets put in place just like a hatch cover.
Sure this would add a bit of weight and maybe get in the way of rod storage in some situations but it it keeps a yak afloat in an emergency or saves a life, I think it might be a good trade off.
Bob
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