It's a be'atch to get in there no matter what. Don't know you're situation, but what I did has held up for 10 years.
I'd bust my butt to make it happen, dry fit all to perfection first. Maybe pre-drill holes thru the support wood. Use a bunch of that that really good 3M plastic velcro to hold the wood in place. Screw from underneath, thru the predrilled holes into the bottom decks balsa - but not up thru top deck. Do this in a few places. This should hold your support wood in place. Then drill thru template from the top thru the deck and the support plywood. IMPORTANT - Try to drill 90 degree holes - us a jig if you have to. Otherwise the windlass bolts go in cock-eyed and create a PITA ! From below remove 'holder screws', remove 'velcro' - slather plywood with thick epoxy or 5200 - re-drill holder screws to hold wood in place. Mount windlass with bolts/nuts. When done remove holder screws.
Tough job but once it's done it's done. Then go drink some beer to help all the aches and bruises you have. Clean your scraped and bloody forearms and fingers. Tomorrow will be a new day : )
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