How beautiful! I am hoping to get my yard to look like that some year.
I used a door from a horse stall as my coop door. It has similar bars in it in the top half, only vertical. I had to cover them with wire fencing because when my pullet learned to fly, she would fly up and squeeze out between the bars so she could wander around the barn. By the way, a wandering chicken poops on everything! I would have to put her back in the coop everyday when I got home from work.
You may need to have an Option 2 for when you get more chickens and put young ones in there.