So, I got outside this afternoon, after another trip out shopping, and I got the final wall up! Technically, the only wall here is that piece of OSB on the left that has the Orange spray paint on it, the rest is the "people" door, lol. But, it works! I attached a 4" wide piece of thinner plywood to the edge of the OSB, so that it lines up with the thicker plywood I used for the door (and the back wall). That piece of plywood is also what I attached the locking mechanisms for the door to (thicker than anywhere else, so more secure).
There is a bolt-action lock at the top of the door and a hook & eye at the bottom (I had planned on putting a second bolt-action, but nothing is sitting quite "straight" so I couldn't get things to line up). It takes a little work for the bolt-action to line up, but once it does, it's really secure! I'm guessing my whole hen house leans to the front a little, because the door swings open very fast! But, once it's open, it stays that way quite nicely! I will attach a chain with a small spring-closed clip to hold the door open when I need it to be open though. I still need to figure out where I'll have the pop door (somewhere on the main door), finish the back wall (the small piece of wood on the right is stuffed behind the longer board and is blocking an opening that runs from the top down and is 8-10" wide), wrap the right hand corners in hardware cloth (added ventilation where my boards didn't line up right), paint the whole thing (inside & out), and get some paneling up on the interior for the roof! But, they have 4 walls now!
I found a roll of Tomato Twine today while I was looking for regular Twine. It's a huge roll with over 800 feet of twine and the only other twine was Sisal twine (way to rough for what I want it for). So, the boys are going to get to make green twined hanging planters!
I also made a stop at Michael's (it's next to Cash & Carry) and picked up nice wide picture frames for $1 each that I'm going to paint with the Chalkboard paint! I also got some "craft" paint in Bright Yellow (oldest Nephew's favorite color), Bright Blue (another favorite, but I forget which of the other two boys), and Bright Red (the other one's favorite color) to do the backs and edges with! I got a fourth frame to make one for the nephew on the other side of the family as well, but I'm not sure which color I'll use for it. Only thing I'll need to find to go with them is a little bit of chalk! I also got a couple of "kid sized" plates for our house that have a cute black & white chicken on them and say "Rise & Shine!" on them. I don't like giving the kids full sized plates, because other adults seem to think the kids need a full plate too. And, we tend to use the one "kid plate" we have here as soon as it's washed for snacks and/or light lunches! I paid $1 each for the plates and $0.59 each for the colored paints.