Addition to above, to not bloat it more. Customizable above-water design. - Freeboard height/number of above-waterline decks - Forecastle - Poop deck / stern cut-off (look at Hood and others) Adding more decksĀ  enhances ship's behaviour in heavy seas and crew accommodation, but hits negatively it's weight, stability (esp. with guns on top), detection ranges and cost. Lowered stern decreases reverse speed, while raised stern decks increase it. Also obviously floating castle is easier
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