Hollow sounds are an indication,... not a death sentence. If you have hollow sounds that's where you should drill pilot holes to be sure. It could just be the fiberglass and the wood are not touching (bonded to each other) anymore from a lot of reasons (like drying out over the years, etc).
Drilling the holes and then sealing them up again could be a lot cheaper than taking it apart only to find that the only thing wrong was your taking it apart. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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