The only places for resin inside a styrene hull are around the propshafts to fix and seal them, and around the rudder tubes.
Any superstructure that lifts off is best done by sitting it over a coaming so that water washing over the deck has a chance of running off the outside before it run down the inside. In any sort of wave pattern, although it seems to be OK going forward, do not try reverse at anything more than a crawl. I've seen a couple act as water scoops.