9. The Modernist Floating Cube
If you appreciate clean lines and architectural simplicity, the Modernist Floating Cube is the perfect weekend project. This design consists of a single, perfectly square plywood box mounted directly to the wall using hidden French cleats, giving the illusion that the cat house is floating effortlessly in mid-air.
To make this design stand out, paint the exterior of the cube a crisp, matte black or white, while finishing the interior in a warm, natural oak or walnut veneer. Cut a circular opening on the front face, slightly off-center, to add visual interest. You can also cut a small slot in the side for ventilation. When mounted near a window, this floating cube becomes the ultimate sunbathing platform and bird-watching station for your curious cat.