No, under the floor is wood between glass. Actually, lots of little plywood squares. You can find some pix here if you look around. What you want to do is save the outside deck skin and fix from the bottom.
If you take the cap off and flip it (easily said...) you can cut out bad wood from bottom. The cap is "glued" with a poly resin filler/adhesive. Much of it has probably already broken loose and is probably blocking the drains in the bilge.
Make sure your repair is not thicker than original because the cap has to fit when it goes back on.
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