[oldbluesplayer]

Nick -

On the berthing platform, in mine, there are three wooden hatches, if you lift up / take out the cushions; one on either side as you walk in, they have molded in fiberglass bottoms, and forward, there is a larger hatch in the berthing platform - I'm not talking about the forward rope locker - I had a marine head, in mine, at the end of the cabin walkway - the two head hoses went forward,thru the liner wall at the end of the cabin walkway - the thru hulls for those hoses were under that berthing platform hatch. On the inside of that liner / walkway endwall - now, your looking down into that hatch, and backwards towards the walkway endwall, was a glassed-in piece of plywood, glassed to the liner walkway endwall, and tabbed to the hull, and tabbed to the forward ends of the stringers - you should see those, down in that hatch. (mine is a '73, with the large foam filled box stringers) On mine, I discovered last fall, this tabbing was completely failed / broken, on both sides, all the way up.

This would have had the effect of releasing a major capture point for holding the liner to the hull. As the liner structure stiffens the hull, this release, I am sure, caused the looseness in the hull that I began to feel, particularly to torsional loading - as in quartering into a head sea, taking the hits unevenly, on one side of the hull... coincident to this I began to observe the cabin bulkhead wall screws loosening up.

This same torsional loading would have produced the doorway corner cracking you were beginning to observe.

I thought of taking pictures last fall, and never got to it - Let me know how you make out.

Bill