A trimaran shape with 2 airshippy-boats supporting a central 3rd airshippy-boat-deck with an electrolyser maybe an answer for weight Many options, don't be a crimpy wedgie 😁

A 100 boat assembly lines churning out a recycled rubber boat every 30 minutes will make a million plus boats (assuming 50% capacity with 50% downtime) in the first year A million boats a year is not enough, it has to scale up to the billion With such quantities small recycling too will go a +