I love this stuff. First, thank you for taking the time to post this and share your weathering skills. I hope I can get one of these built someday.
I do see one thing missing, a car rim bolted to the wall for the air hose. One would look great on the end of your low wall, right out in the center of the shop for easy access. One for a water hose would be handy as well.
The photos with the light shining through the windows are awesome!
AzTom