I ordered this cat tunnel a while back. It took a while to arrive, but I wasn't in a hurry. When I got it, it took a while to figure out how to assemble it, but finally I figured it out. We have two grown cats, neither of which seems interested in the tunnel, but I can tell it's because the tunnel is more suitable for kittens size-wise. Our newest cat doesn't seem to like enclosed spaces. Anyway, I ordered another tunnel to make it twice as large at the ends. I'm thinking this will be suitable f...