Thank you! Half the fun of their room is coming up with new ways to make it stimulating for them.
I thought my cats had a pretty nice setup until I saw your pics. Their room in comparison looks like the flintstones live there while yours looks like the Hilton. I am going to spend the day working on improving it. I need a new cat tree and I am going to look on the net to find one of those tubes!
If the op builds a room like this for her cats she will not need to worry about the dobe interaction. The cats will not want to leave their room.