Wow! A lot of parts, lots of ties (essential).
The best cat item I have ever bought (except for flea prevention).
Once I started with assembly, I realized the shape it shows in the picture wouldnt work for me. Since it was like Legos in a way, I thought of a new shape with many areas for the cats to separate themselves and to explore .
It attached to my house through a tight connection where an ac side panel went. Cats in it galore!
Sure I had to get in where one of my big (22 lbs) collapsed a panel, but I planned for it, so the repair was easy.