Also, these panels are much too large to do without reinforcements  underneath.  When I make the new ones I will apply white-pine sticks,  3/4" square, to the undersides using epoxy.  Like ultralight-airplane wing  ribs, the size won't matter as much as the fact that they're there and  adequately secured so as to be structural.
By the way, when I designed interiors at Cherubini I always specified 3/4" plywood for bunktops, especially doubles.  Even so these still require some honeycombing of bulkheads underneath to lend stiffness and strength.  I would consider reducing this thickness and weight to 1/2"  so long as the bulkheads below were well secured, well treated in epoxy and numerous enough to lend the required rigidity.  I would never use 3/8" for a bunktop under any circumstances-- unless those circumstances were that the 3/8" was already installed on my antique boat!
I simply cannot wait to paint this area; but there are lockers and stuff to install here.  This was the space in which I stored raw lumber during the rest of the project and it's only become clear again recently. 
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