Originally posted by Cataholic
I am wondering about the curved parts...are they wood?
The perches are made out of a cardboard material called Sono Tube. It is the cardboard forms that builders use to make concrete column and pillars - sold at hardware and building stores. We bought the Sono Tube which is a complete circle and then cut it in half long ways to make the curve piece. I then covered each curve (perch) with carpet. My dad cut the tube with a table saw but even a handsaw would work. The top two perches are cut sono tube and the botton thing is a tunnel which is a piece of uncut sono tube.

I hope I made that understandable. I have a hard time explaining things. Actually, I found the plans for the cat tree online and it is very easy to understand. My Dad followed the plans but made a few minor changes that he thought would make it more sturdy. Here's the link to the cat tree plans:
http://amby.com/cat_site/cattree.html