the area in the middle that is thicker looks to be the critical part to support the anchor. was the entire core (the middle part and the areas around it, including the foot switch area and the aft area) initially molded as one piece, epoxied and laid upon the bow bulkhead (the wall at the end of the photo)?
now the idea is to remove the rotten core in the middle and replace with a starboard/acrylic. the new core will only be glued to the top layer with epoxy. pulpit is then bolted to this new core and windlass on top on the pulpit also bolted to the core (the backing plate is likely also supported only by this area). Could the windlass pull the entire new core away in a storm?
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When the boat was built, the deck was built separately, and what you’re showing was actually on top. So, yes, the thing was built and then flipped over and fastened to the hull.
You are right to be concerned about the strength of the entire unit. This isn’t the place for a substandard repair. You will want to be sure prep the surface well so you get a good bond to whatever surface you leave.
I’d probably use good marine plywood for this repair. You want something with good compressive strength.
I bet doing it like Dave says wouldn’t be that bad. Lay in the opening and use a multi tool to cut the entire perimeter of the cored area, do a couple of cuts across to get it into manageable size pieces. Hammer and chisel, and multi tool with big flat blades to separate it from the deck. Grind it nice and smooth. Whew, done with the dusty part.
But, before you begin, prep the area. Remove all the cushions, and soft surfaces from the area. Maybe even bag it off with plastic sheeting so dust doesn’t get all over the inside of the boat. Put more plastic down to catch everything that might fall into the bilge. This makes cleanup a lot easier.
Do clean up all the dust and debris before starting the reconstruction.
Cut the new plywood to fit, take care to round over the sides with a router. butter it well with thickened epoxy and glue it in place. Use enough epoxy so you get good squeeze out on all sides. Wipe it smooth after you brace it in place. Pieces of lumber cut to fit from your platform to the new plywood will lock it in place. Let it cure.
Next, use epoxy filleting compound to round the sides so the glass lays down without air pockets. Then do the glass layup.
Check out the fiberglast website for tips on doing the glass work. Good stuff there.
When you get to the point where you’re drilling the new holes for mounting everything be sure to seal the exposed core with epoxy. That prevents water from getting in and starting the rot all over again.
Doing the work from the under side eliminates having to tent the foredeck. All you need to do is tape down some plastic to cover all the holes.