If the electrolyser is too heavy for the recycled automotive tyre rubber keel then a 'deck' or rather a supporting frame instead of a whole flat deck, made of reinforced plastic or alum to support the weight of the electrolyser Also, reduce the weight of the electrolyser

Boat size is not a problem, the materials are all recycled, the bigger the better Heck, a whole football field-sized boat to support a single electrolyser is also not a problem It's so ridiculously low cost and so lucrative while fixing the Clima that nothing else matters 😊