Has anyone done or considered cutting vent holes in then front of the main cabin bunks/seats? Noticed #97's funky smell mostly orginates from there, i attribute to lack of air flow. (or is the funk normal :) )
I would expect a stale smell in those closed spaces, and remember a stale smell there when I bought 'Faith' and there was moisture in there. There should be a small limber hole at the lowest point of the bulkhead, but mine were plugged (pretty small).
The water I found had come from a leaky chain plate. have had no odor since resolving that problem. Might want to look for a leak.