tcm tour Bf over the years BF used many different grade plywood's some years were top grade marine multi layer marine other years were not! It" appears "? they upgraded several internal materials to non degradeable materials and" may" have fixed a weak stress /flex area of the body that caused internal wall and fixture separation if you loo close at some pix you'll see a plywood strip clamped to shell in the mold I have seen some of these completely fiber glassed in and other areas only partially fiber glassed in place please note in these pix and article both a 1500 series and a 2500 series are shown try to notice the difference in insulations & construction
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