Duncan,
If you are redoing the deck, figure out where the footprint of your leaning post and t-top is going to eventually be, If you want to be a real stickler, do it for the console as well,
cut some alu backing plates 3/16 ish thickness (i think you can get 6061 plate that's just over 3/16 thick) for everything you are mounting, make them a couple of inches larger than they need so you have a larger margin for error
Transfer all your measurements including the size of the backing plates to both the top and bottom sides of your new core sheets,
using a router, set to the thickness of the alu plate, route out the shape of your backing plates on the underside of your core sheets,
Sand or grind the shit out of your alu plates to expose fresh metal, remember, you have 4 hours of exposure with freshly sanded or ginded alu before it develops a corrosion layer and it loses its adhesion properties,
Epoxy them into the areas you previously routed out, do not encapsulate the alu plates into the core, if any moisture makes its way in through the bolt holes, you want it to have a way out,
once you install your new deck and glass it, you can come back with your measurements and drill/tap/bolt down everything in place, make sure you use tef gel (do not skip this step)
This setup is bullet proof,
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