Anthony~
Got LOA and beam for the Higbee? I remember when I first saw this box (a year or so again?) that the cockpit opening is aft of the bow (forward transom). That would certainly help move the center of mass aft - so she would be more likely to trim better along her length. (I still prefer my " open down to your toes" canvas, though - for ease and speed of egress when a bird goes down....)
As Roy had suggested above, I had toyed around with the idea of a longer, wider coffin - that could tow across the bay - then drag and paddle into good gunning. I left Long Island before I could follow through with the R&D. Any such craft would, of course, abandon the "single sheet of plywood" criterion from my original design.
Best of luck tomorrow!
SJS