I learned about reverse engineering a game by reading the according reverse engineering notes to Wing Commander I and II, which can be found on the forums over at www.wcnews.com
I also was playing around a little bit with Wasteland (the original one) a few years ago, before the sequel became famous on Kickstarter. I even started re-implementing a browser-based game engine, which you can find here http://www.upnp-database.info/revival.
Currently I am trying to find out everything about modding Street Rod 1 and 2. The latest information about the franchise can be found on www.streetrodonline.com.