Just an FYI - it is very easy to get the overall length and total height of a model in Blender. A few camera tricks then lets me slice it in Photoshop above and below the waterline so I can get the Height and Draft too.
At a quick glance, the vessels I have checked are pretty accurate in Length (1-3% error) but the Draft is a little iffy in places (5-10% error) . It is the Height that is way off for a large slice of ships by up to 60%.
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