3 things that stand out right away:
-are your soffits open for winter ventilation?
-can the latch on the run door be opened from inside?
-that ladder to the roosts is unusable.
Suggestions.
Put your poop board just above the nests, 3.5-4' deep with roosts spaced 12" from wall and 18" apart. Feed and water hung underneath poop board. That'll give you 12' of roost length. Tho a 6x8' coop is tight for 12 birds in your climate.
Think about snow management...around run door and especially the run roof.
It would be good to put a solid roof on the whole run, and put up some plastic on 3 sides to block wind and snow. This will give them more space than just the coop during the nasty days of winter.
That board thing in front of run door is not necessary, and will be unmanageable in the winter, if your paver threshold goes into run.
I made a 'patio/threshold' in front of and under the door. The chooks dug underneath it. So I added the row of bricks. They dug underneath it. So I added the 2x8x16" pavers on edge and anchored them in with rebar. That has worked well so far.
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I am inspired by your patio threshold. I had major issues with my run gate this winter (I should say this spring when snow melted) and reworking it is in the summer plans. This just might solve my problems!