I hope your boards work good as roosting bars for your chickens. I use 2X4s, and it looks like you are using 2X6s. Would be interesting to hear how that works out for you. You just want to make sure that the poo is falling off behind the roosting bar at night and not getting on the boards themselves. If you find the boards are getting soiled, maybe you could rip them down to a 2X4 size. At least I can tell you that my 2X4 boards do not get soiled, but I have never tried 2X6s as roosting bars.
One recommendation, the stump with board in the back of the picture looks like it is very close to the wall. You want enough distance between the roosting bar and the wall or your wall will soon be covered in chicken poo. Keep an eye on that. Looks easy enough to move the stump if needed.
One concern, in your picture, there is a screw sticking up about an inch on the board on the front stump. That could really cut up a chicken, so it needs to be screwed down flush or removed.

Chickens don't weigh very much, but the way you have the boards attached to the stump appears to resemble a teeter totter. If all your chickens decide to roost on one side of the stump, it might tip everything over to that side. I had 10 chickens, and they would often crowd together on the last 4 feet of their roosting bar despite there being plenty of room on the other side. I don't remember how many chickens you said you have, but I would keep on eye the possibility of tipping the stump over to the heavy side.
But, hey, I love your approach with the Zero Cost Coop. Hope the changes you are making work out. Keep us updated on your results. Always interesting to read what others find works for them.