I saw the home-made version on this site about 6 months ago, and last month I decided to make one. I got a really big storage bin with locking handles on the sides. This made it so the top can't pop off when kitty jumps out, and the bigger ones had sturdier tops as mentioned. I also put a track-free mat on top. In all it cost me $14.
I have three cats that all use the same box, and they liked it immediately. I kept the old box available (just in case
) but they preferred the big box.
The reason I made the box was to keep my daughter's beagle from eating out of the box! She got a terrible urinary infection from eating cat litter.
This worked great for everyone!
Thank you to the original poster of the home-made box!