Step 1: Long story and parts used.
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
Step 2: Sizing up the cat
I cut 2 boards out, so they are 11.5" X 22". Since my cat is old and fat, I figured I should make the perch with a lower level to help make it easier to get to the upper level that is at the window.
Step 3: Cutting up the PVC
My logic went like so... how long to cut the piece of tube that is between the 90deg elbows to come up with the 11.5" width of the board. Same thing for the "T" to 90deg elbow. I started at the top and worked my way down. Once I had one side figured out, just copy the cuts for the other side.
Step 5: Yet more frame info
Step 6: Add the boards
Toss some cat nip onto it and see what happens.... not much. She didn't seem to care much for her new perch. Hmmmm
Step 7: Needs fuzzy love
I took the boards back off and wrapped some carpet around them and used a staple gun to secure it on the undersides of the boards, then mounted the boards back to the frame.
Picking the cat up and putting her on the top self a few times didn't go over so well, but after a couple of days she would jump onto it on her own. Putting cat nip on it helped as well. There is now a towel on the top shelf so we can remove it and shake it clean every so often.
Our fat cat tips the scales right at 15lbs. I built this perch several months ago and the cat loves it. I didn't glue any of the PVC pieces together and it is holding up fine.