With this set and the bunker, we made a 3 x 3 contraption that we have anchored to the wall with a simple strap :) Unfortunately, one of the scratch ramp's tubes bent in two while I tried to push it down into the hole it was meant to go in, and the sisal part is pulling away from the fabric into a huge irreparable hole, so I'll have to toss that part out soon. Also, one of the Velcro strips is coming off the fabric : We made do with it for now, but I don't see us keeping this thing for more than a year or two. I was hoping for something more permanent. I'll have to build my own cat house, like I'd planned in the first place :) I've had this for about two weeks now in total.