Handmade Diy Cat Tree . Get your hands on some plywood for building the base of this homemade cat tree! Along with that, you will need an 80lb bag of concrete, real branches,. moderndiycattreemadefromcardboard HomeMydesign from homemydesign.com The abstract branches support carpeted platforms, creating a functional piece of art. The top of the cat tree will have multiple top pieces: This free cat tower plan at imgur stands 6 feet tall with 2 platforms—one at the top and one a few feet.