AmeliaBedelia
Crowing
Yes. I decided against sand - sounded too much like having permanent litter in a litter box that I just scooped and scooped but never changed the litterI was getting closer to not using sand after everyone's amazing suggestions - you just tipped me over the edge. No sand. Thank you for this story.

Deep litter/bedding works well for me. And I figure it is closer to nature - animals poop in the woods and leaves cover it up and it turns to compost. As long as your chickens have enough space, it doesn’t build up too much.
I actually have found my favorite material for the run is last fall’s dead leaves. I use pine shavings in the nesting boxes, where it is more of a “deep bedding” situation. I dump that into the run as needed where it turns to “deep litter” and decomposes with the leaves. Never had an issue with smell.
I would recommend considering your winters? I live in the south-south, so I actually have more of an aviary than a traditional coop/run (2 solid sides, 2 hardware cloth), and only have to tarp it for a couple nights per year. Where you are, you may want to integrate into your design and plan a way to screw on clear polycarbonate roofing panels to close up the bottom 2/3 of the run walls in winter. Depends on your breeds and typical winters, but an idea to consider. Also makes it more pleasant to hang out with them in the run in winter Ive heard.
Again, this is just what I’ve seen others do.

Oh - since your run is secure and the coop will be open to it 24/7, I would also add a roost out there. Some chickens like “camping” out there, and it creates space for them to spread out if someone is mad at someone else.
I also 2nd the recommendation for two pop doors, one on each end. We had a chicken corner another one once…it was awful. So now, no dead ends!