I am documenting my Harley Davidson databus interfacing and some other Harley hacks over on the bagger tech forum. Thought you guys might be interested: http://baggertech.com/forum/showthread.php?551-Road-Glide-Hacks
Good job on your work! If I understand correctly, you are controlling the stereo system with the Arduino? Have you also tried to read engine data with the Harley data stream?
Yes - reading the Harley data stream too. You can see my test platform in the video on thhe first page.
Know that I have had a chance to watch the video, I got to see it in action. Well done!