Finished: Cat Box Posted on August 31, 2013 by mrtrick It is said that children would much rather play with the box than the contents. This works with cats too! Step 1. Cut a hole in the box. Um… Find something round about 15cm dia, trace around it, then cut out with a hacksaw blade or serrated knife. The top of the box is double-thick. It helps to tape the flaps down before cutting. Just use something round as a template. Cats like little windows to look from, as well as doors. A window at the top level, and a window at the bottom level. You may find the box becomes prematurely occupied. Shoo! Get out of the box! The old base of the box will become a shelf. Cut a hole, same as before. Styrofoam can make a horrible mess. Run some stickytape over the cut to help remove any loose bits of foam. Line up the shelf inside the box where you want it. Trace a line. Then trace another line 2cm further. It will become a locator for the screws. Press a screw or blade through from the inside where you want the screws to go. Hold the shelf in place while you attach screws from the outside. Shelf in place – and the box is stronger. I had an extra piece of styrofoam, so made a ‘floor’. This just screwed into the bottom of the box. All done! And the occupants are already interested.