I think ya have it backwards happy, don't ya know cats are the ones that own us? :lol:
As for my cats, I haven't made them anything like that, but that's a really neat idea! I did see, however, someone on youtube who turned his entire house into a kitty playground. I think he said he spent over $90,000 on all of it, from designs built into the wall for them to walk on, to air purification systems for his multiple litter boxes located in their own little rooms around the house. If I ever come across it again I'll be sure to post it.