I ended up building this from a free play fort that I got on Facebook marketplace. I swapped out one of the sides with 8 foot boards to make the floor space 4'x8'.
I will be building a fancy roof later (before winter) but for now it gets a tarp on top.
The bottom of the roof wood has hardware cloth attached and there's a piece of OSB (like plywood) on top of the roof wood. The OSB is not attached or fixed in any way. This means I can take chunks of 2x4 and slide them under the panel to adjust the ventilation as I prop the top up. This will let me play around with what works well for them.
I used a pneumatic staple gun for all the hardware cloth. I did a test and tried to yank it off and even with all my strength I was unable to pull the hardware cloth off.
Here's it before I put the sides on where you can see the roosts:
Here's the front with the pop door. The run is going to be the swing set and going to attach to those braces above the door. I've closed the gap at the top left with a 2x2.
I've got some extra panels to put over the front ventilation to reduce it if needed.
I'm finishing the run this weekend. I'm keeping the hens inside the coop for the first few days to get them used to it since they were from a big commercial hatchery.
Here's the side with the hinged flap down on the right. I'm having issues with it currently because it isn't holding tightly and the panel can be pried up.
You can see here that even though I've latched it with a hasp on the left, I can pry it away a couple inches.
We got the hens today so I've got a ratchet strap all the way around the middle of the coop to keep the panels closed until I come up with a better solution. I'm very open to advice on how to better hold them closed!