u/Beginning-Curve2036

Recently got one that was gutted out wanting to redo deck and floor and add on to the deck to make it longer. My main question is what kind of plywood do yall recommend just spending the money on marine grade? Or getting good plywood and sealing it yourself? ( will be gluing carpet on top of it also) Any input would greatly be appreciated! Also if y’all have any other ideas feel free to share them haven’t started yet just got motor running good before I started to spend to much money on it!