Build Cat Tower Where, By Either Snailmail Or Downloading, Can I Obtain Free Plans To Build Multi-level Cat Condo/tower?

Where, by either snailmail or downloading, can I obtain free plans to build multi-level cat condo/tower? - build cat tower

I am an unskilled carpenter with a tape measure, hammer, screwdriver, handsaw. Oh, I also have an electric drill and a level. I carpet remnants and debris of plates and we hope that we do something like Nirvana cat entertainment for much less than the $ 200 - $ 500 price ranges from a few manufactured products. Comments?