Welcome to BYC!
I'm a beginner too but I'm really impressed with your fore thought and planning for your coop.
I only have 4 chooks but things I would suggest are:
* have your nesting boxes at a good height for you to harvest and clean out (about waist height)
*make sure all floor areas in the coop are easy to access and wide enough for a rake so you don't have any horrible little corners that you can't get to ( though your set up looks like you won't have that problem!

)
*Plant even more chicken friendly herbs and plants around your run. My chooks like to peck at the comfrey, wormwood, parsley, thyme and oregano growing just outside their run.
*Try having a grazing box or two in the run so they have grass to peck at. Here's a link to making one
https://www.attainable-sustainable.net/diy-grazing-boxes/
There are also several threads about them on BYC
* I have a little stool in my chook run. It's nice to sit in with the chickens and just chill. They also get more used to you that way

.
I'm looking forward to seeing your plans come to fruition!