Rain water coming in through the inside of the mast?
Well, it looks like I''ll have to live with a wet bilge. As for the floor supports, they are not part of the structure. They are an add-in after the completion of the hull which has it''s own molded in hollow stringers through out the vessel.
Jeff, you make a good point about the stepped mast for off shore. I''ll keep that in mind for my final vessel (retirement). And thanks to you both for the input