Re: Adding woodwork below
I don't know if you have already done the bulkhead work, but I would likely remove the current half-height one, and use it as a partial template to cut a whole new piece. One piece will be stronger, and look infinitely better than two pieces joined. As for material, I would laminate a heet of lauan (sp?) door skin plywood onto each side of a piece of 3/8" ply. You'd end up with a very strong 5/8"-ish bulkhead, with nice sort of mahogany on each side that will take a finish very nicely. Lauan ply is pretty cheap, select a couple of pieces with nice uniformity and colour.
I am nearby, I wouldn't mind checking your progress.
Bashing about on Lake Ontario and Beyond
"Ariel" '79 Endeavour 32