I had the great pleasure of testing The Cat Cave for Knot by Gran'Ma recently and it was a blast. I love how the finished product turned out and the pattern was very clear. I did two different versions of the Cat Cave...one in WW yarn and the other in Bulky yarn. I personally like the bulky one better.
My two kitties, Lucy and Coco , like them very much.
You can purchase the pattern here: http://knotbygranma.com/2014/05/17/cat-cave-crochet-pattern-release/.