I left mine original, natural colored fiberglass. I kind of like the look. The hull thickness at that point is 1-3/8 in thick, so a 1/2 inch screw for my bilge pump (or float switch is fine). "Oh that smell. Can't you smell that smell?"Once you remove the false bottom and clean it up, what did everyone do next? Did anyone put some new glass down without the plywood. or is safe to leave as is and put a small screw in to the new bottom to keep your float switch secure. I am in the middle of cutting mine out and I am not sure I will ever forget the smell I could almost taste it. I am not even sure what to compare it too.