Hello all! I guess this'll be a 2 week update, if anyone is interested.
I've taken and implemented some of the stuff you all have mentioned. Of most importance: ventilation.
Here in central NC we're having some major flash flood's so I'm trying my hardest to keep these girls as dry as possible. I've affixed a sort of janky tarp contraption on top that seems to be working 'okay'. My girls seem a bit annoyed at some wet feathers. I hope I'm doing enough!

The inner coop seems to stay dry which is what I was most concerned about. The run however is a bit of a muddy, pine pulp, hay and chicken poop mess. I also dug out a quasi trench since this coop is on a slope. My house is at the end of a cul-de-sac at the lowest portion so we get some serious rain / water.
I've added, what I originally intended to be, a dust bath. It's a bowl / planter filled with a bag of playground sand. The girls are more or less eating it than actually bathing. I've learned that chickens naturally eat gravel / sand for their digestive process. Cool stuff! I was worried they were messing up the sand for the feed. Lol

I'm going to have to get some sort of kitty litter scooper if these girls are going to be eating the gravel, because well, they like to go to the bathroom literally everywhere.
Here is some back side ventilation (x2 vents). I'm only going to make them this wide (about 15 inches) in order to conserve structural integrity of the coop.
Furthest back side vent port.
Inside the run hanging out with the girls.
Different angle.
This is my most clever girl. She's very inquisitive and brave. Every time I enter the run she's the first to say 'hi', start pecking my shoes or hands, and ready to jump out at any moments notice. My daughter has decided to call her 'neck pearl' because he neck feathers are molting.
Another girl with some damp feathers.
What are some ways to ensure dry chickens without having to revamp the entire chicken coop? Does anyone keep a fan / heat lamp inside their coops? Any ideas are welcomed and thanks again everyone! We're loving keeping these girls and the eggs are amazing!