This is the one my dad and I made in Feb. and hubby carpeted.



This is the one my Dad made for me for a Christmas gift two years ago.



Here's a link to how to make the second one. He made a few modifications to it, like the tunnel for the bottom perch. Mine is also a little taller.
cat tree

For the first one pictured I found it on ebay and got the dimensions and then dad and I made it with some modifications.