“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).”
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Do It And How 