Cave Lion fashions a fantastic Billy Cat climbing shelf. It looks pretty easy to do too. Looks fun!
“I made an Ikea hack of my own a few weeks ago and thought you’d like to share it too. The shelf is made from a 40cm wide Billy shelf and it cost only 15€ (the shelf was a bit damaged at the store but it suited our purpose fine) and 5€ for the carpet (so that it’s not slippery). We also added a few corner irons and bolted the shelf to the wall so it wouldn’t fall when our cats play in it. …
40cm wide might be a bit too small for most cats but not for this breed. The shelf fits in the tiniest area, providing our cats access to the top of a closet with minimal damage to the walls of our rented appartment. The pics propably say more than a thousand words about how the shelf was altered, but I must say that we did use a lot of glue on the boards so they wouldn’t flip (in addition to the corner irons).”
See more of Cave Lion’s Billy Cat climbing shelf. (It’s in Finnish but you’ll get the picture.)
You may also be interested in this ready made cat tree condo scratcher.