I have released the source code to my Dreamcast Fenix game, Primitive Nightmare. It's ugly, full of spaghetti code, redundant processes, and bad formatting with very few comments, but it might be useful for someone learning Bennu/Fenix or for someone who wants to either port or modify the game. The code is public domain, so do with it as you wish. I'm not really concerned about credit, but if you use it, please at least tell me so I can try out what you've done.
Grab it at http://www.fusekigames.com