the tree was actually fun to put together, good instructions, all the nuts and bolts, etc.  i couldn't get that middle piece tight and secure, it wobbled, which scared one of the boys, so i removed it.  at the end of the day, they are enjoying it.  one more thing they like the hanging toys, but one of the kitties chews on the elastic string inside the tunnel, so i had to secure that better.  can't have the cats swallowing elastic string.