I have 2-3 soft spots in the floor of my boat. It is understandable since it is 35 yrs old. I would like to fix it as cheap as possible, but it still be effective. I know its just a bandade, but how bad would it really be to lay 3/8 plywood in the floor, screw it down, and cover it with carpet. The soft spots are only about 8-12 inches wide. The rest of the floor is solid.