No expert, in fact new to RV.net and getting acclimated to the camping (trucker campers) world, but I have done a lot of work to my wood core fiberglass boats over the years. I have removed a lot of rotted wood and replaced. What I couldn’t get to there are good products that you pour into the rotted core wood to transform/ harden to a stable material. Excess fluids do need drains and allowed to evaporate and dry before sealing. And wear respirator for fumes/good ventilation. Caring for boats for years, a big concern is a tarp(s) that can’t breathe and hold/trap condensation. Good luck with your project!!
