Hey, I just bought a 1990 Wellcraft sportsman 25' I/O. This is a complete restoration and I have found that all the stringers have rot in them. I just replaced the transom so I'm searching for the most efficient way to fix the stringers. Do you have to cut out everything or can you cut the fiberglass skin off one side or off the top? Then replace the core with wood or filler? Pls help with any suggestions?