We've seen an AT-AT cat playhouse before, and now there's an AT-ST. I don't really have any more info, I just found the pics on The Bloggess's site in between posts about her weird taxidermy fetish. So it looks like it's up to us to make up our own backstory. I'm going to go out on a limb and guess it was built by a guy who loves his cats AND Star Wars. Remember: the simplest explanation is usually the right one. Or maybe the whole thing fell to earth like a f***ing asteroid, I don't know. "I bet he got it in a McDonald's Happy Meal." Now you're thinking.
Thanks to me, for being in touch with my inner cat enough to admit MEOW MEOW MEOW MEOW MEOW.