In the living room area there are 2 windows and one of them has a sofa in front of it. The cat would lay on the back rest of the sofa to see what all was going on outside (damn birds). I had some boards that were part of a shelf in one of our closets that were collecting dust, so I decided to see if I could build a shelf under the other window for the cat to rest on.
Some of the things I did have on hand were the 11.5" wide boards, some black "automotive" carpet and various wood screws.
Items I had to go out and purchase:
Two 8ft 3/4" PVC pipes.
Ten 90deg elbows.
Eight "T" fittings