The interior coop is 4x8 with exterior nesting boxes. Feeder and waterer are outside. So, that should be OK for 8 chickens (per the rules), right? I have 6. The run is 8x12 and goes under the coop, so that's technically sufficient for about 9 birds.
And yes (good memory!), you are right, I have had a few interior coop issues, posted before, and removed one of the higher roosts. But tomorrow I am taking out the rest of the higher roosts and leaving just the two lower roosts. So that will be 8 feet of roost for 6 chickens. Both remaining roosts will be about 16-20 inches below the opening of the window (cracked 2 inches at the top), a 1x2 gable vent and 4 feet of ridge vent.
The 4/10 rule is minimal guideline, IMO, may work fine for some and not for others.
I think your roost plans will work fine.
Where is the window you'll have "cracked 2 inches at the top"?
Making a coop page would be good

Ridge vent may be worthless once covered with snow.
Where is gable vent?
Under the run roof would be a great place for a gable vent.
Coop is kinda tight but might be fine especially if you tighten up the run.
And we will be adding those clear roofing panels to the bottom of the run so that the girls are protected from the wind in the winter.
I would cover most of run walls up to about 6" from top.
At least on back(opposite of door) and end...maybe even the one panel right next to coop on front, leaving door and adjacent panel to the right open or blocked low.
Looks like you have a bit of ventilation on eaves area?
Are circled area open to the outside?
It really is a lovely build, and looks like it could be easily extended with the skills at hand.
Something caught my eye, put your carabiners on chains so you don't lose them in the snow.