OK, it's not a cat, but it could encrypt a message with the word cat in it . . . along with "be sure to drink your Ovaltine". My wife and I do Geocaching, an activity that can include solving a puzzle in order to get information (GPS coordinates) that will lead you to a hidden container with a logbook where you sign your name. I know, sounds dumb, but we have enjoyed it going on 14 years now and have had a lot of wonderful experiences, met lot of nice people, and seen a lot of sights in the USA and overseas.
Anyway, I took this Steve Good pattern and beefed it up a bit - made it 150% of original size - now roughly 15 inches by 7 inches and used 1/2 inch wood with 1/4 inch for the dials. I tried the 1/8 inch but it just wasn't holding up to the handling.
I probably violated some scroll saw etiquette by using wood screws to hold the case together but wanted it to endure the handling it will likely get over time.
It was fun to make, but I did learn a little more about the things you have to take into consideration when you enlarge a pattern - like hole size enlarges too (sheeze, head slap!)