This is a neat little circuit, not to hard to build at all... Problem is, how small can i build the radio and hear it work. As you will see in this video, i build it in a pretty small wooden box. The wooden box was purchased at the Dollar store here locally. They also carry pretty decent selection of different size wood and tin boxes that can be used for electronics projects as shown in this video. Enjoy!
...
https://www.youtube.com/watch?v=238xVaYkWmE