Oh! The “brassic” guy! I don’t have much help to offer, but I didn’t know that term, had to look it up and found the tv show :D so thank you.
A tiny bit of potential help: you mention wanting to use desiccant in the boat. I’m obviously not an expert, but it sounds like a bad idea, as the stuff absorbs water… but maybe you mean in small amounts, so that wouldn’t make a difference.
Thanks, I think I get it. There’s a lot of humidity where I live too, so while not at the same scale, the problems are at least relatable. Best of luck with the project, it sounds like a cool but lengthy and complex journey that can really pay off!