It was a long pending project but finished it on one nice evening in last summer. It took couple of hours to fix the auxiliary but drilling hole for passing wires turned out to be the most time consuming effort. It was because of lack of bigger size drill bit and heavy gauge wire. But all well in the end.
I followed instruction from http://www.beaufordbuddy.com/ipod_install_1.htm. There were some difference though. follow the pictures.