I did originally consider solid outside doors with glazed internal windows, Ricky's feedback was that it's impossible to make this rainproof with the outer doors open to let light in, and all the wood then gets wet. With glazed outer doors these can be well sealed when closed (there are what feels like neoprene seals on the mating faces) and there's no wood outside, the inner hinged wooden shutters can then be opened to let light in or closed at night. They look like this from the outside, which I rather like -- the closed near one is the bedroom, the open far one is the dinette (with another one on the opposite side):
It's always possible, but probably less likely than most boats because there's no gas cooker on board which generates most water vapour. The drawers each side are fitted into a carcase box which is sealed except at the front, and the drawer fronts have small gaps between them which let some air from the bedroom into the spaces up the sides of and between the drawers. Should hopefully be no worse than any other way of storing clothes onboard...
It's not new for Finesse, they've done this many times.