I have a recomendation for anyone else who decides to fill or line the upper bulkheads before putting down the deck. Since the bulkheads tend to 'tilt' inward a tiny bit, and since the deck is a fairly close fit at the base of these inward tilting bulkheads, and since the hatch combings tend to make the deck inflexible ... see where I'm going with this?
Question.
Were you ever in the mechanical engineering department and hear a 'thunk', 'thunk' sound? That was an engineer banging his head on the table cuz he found that one of his great ideas wasn't.
- 'Doc

Going after more asprin, and 'calming fluid'.