That's an improvement.
You don't need more than 2 nestboxes -- the usual guideline is to have 1 box for every 4 hens (they'll tend to use the same one anyway), but not less than 2 so that they have a choice.
In your climate and with having an existing humidity problem you need to pull the interior walls and as much siding as possible -- leaving windblocks on the side you expect winter storms from. :)
Look at my brooder -- a big, empty, airy space. If I hadn't been using it to brood chicks I'd only...
I don't remember if you said where you are (you can add your general location to your profile), but climate matters a lot.
In my climate it would be possible to just take the walls off and leave the roof as a shelter -- there's someone a mile or so around the corner who has that as their base...
An Open Air coop -- essentially a roofed run with a 3-sided shelter at the end toward the winter winds -- would be perfect for that climate.
This is my current build: https://www.backyardchickens.com/threads/large-open-air-coop-in-central-nc.1443812/
And the coop in Texas that inspired it...
Welcome to BYC. Where, in general, are you located? Climate matters. :)
The Usual Guidelines
For each adult, standard-sized hen you need:
4 square feet in the coop,
10 square feet in the run,
1 linear foot of roost,
1/4 of a nest box,
And 1 square foot of permanent, 24/7/365 ventilation...