My wife has a friend whom she wanted to build a small amplifier for. This amp was to be used around the house at times when the main stereo was either in another room or not available. As we were brainstorming on what to use for an enclosure for the amp. The idea of putting it into an old book came up, partly because her friend loves old books and it’s cool. This is the finished project, we used an Adafruit 3.7 watt amplifier breakout (http://www.adafruit.com/product/987), some old speakers we had in the junk bin, a spare 5v cell phone charger, I designed and 3D printed a couple of parts, hot glue and of course an old book. Her friend loved it, and it was fun to make.
Here are some photos.