The above linked article is a YouTube video that entertained me to no end. It was a long video, but I laughed during most of it. No squirrels were injured in the filming, from what I understand.
This video is what happens when someone with carpentry skills has way too much time on his hands. He did a lot of research. There is a lot of squirrel info and info on how he built it.
I did particularly enjoy the photo shoot area, and Phat Gus. Squirrels are smart creatures. We don’t give them enough credit, I think.