It looks like you have gotten almost all the wet foam out. Is the brownish/yellowish stuff wet? I would treat all the plywood exposed with the best cupernol/woodlife chem you are still allowed to buy. I have never poured the foam others have used in rejuvenating Whalers but it seems that you are close to that point. It is great that you have shared. I wish I was IT literate enough to load pictures of my Whaler adventures.
