Yes extra draft to have it be a surface ship at 2.4lbs. No one has built one for combat, I have a hull with windows cut that I’d like to get to, another battler or two are considering it. The math on getting armament in the boat under 2.4 lbs is bleak. Model ships ahoy acquired the mold and extra draft can be removed off the top
Couple of things. A. there is a max weight per IRCWCC rules (and other rulesets as well). B. IRC allows extra depth to be added since a scale hull at max weight would either sink or not have enough hull above the waterline to be legal. C. Getting a boat functioning at 2.4 pounds is difficult in the best of times.... you don't really get ballast, you get internals and you have to add depth so you don't sit too low....
