I THINK it is very similar to the cockpit deck layup with a layer of mat and a layer of roving a little under 1/10" thick as the bottom skin (underneath the 3/8" balsa/plywood core)- it has been a really long time since I was into that area though and I did not take pics (plus I have killed a lot of brain cells since then). I would expect the lower skin to easily be able to support the weight of a new core and glasswork while you fix it. I think the core stops about 1-2" from the edge of the cap and the lower and upper layer of glass come together for that outer 'rim'.
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