The most important thing about chess boxing is that it was inspired by an awesome sci-fi comic by an even more awesome artist: Enki Bilal. If you haven't already, you should read his comics, at least the Nikopol Trilogy.
The idea of the sport itself is explicit in the Nikopol comics: https://www.google.com/search?hl=en&tbm=isch&q=enki+bilal+ch...