So I am building a model of Pocketship in anticipation of starting on a full size version in the Spring. I notice that the aft part of the keel construction is a hollow box - a sealed air chamber below the water line. I understand the reasoning that you would not want to fill it with lead as that would make the boat too heavy in the stern. But the idea of having a sealed air chamber completely submerged is just inviting trapped moisture and a place for rot to start. What would be the downside of making the aft keel section free flooding and moving some of the lead ballast from behind the centerboard to in front of it to compensate for the loss of buoyancy aft? A free flooding keel would allow air circulation inside the keel section and give it a chance to dry out.