Lots ( LOTS ) of IPOD info here and other X3 forums

Do you have the in console CD changer?
if you don't then your DIY will be easy, our X3's let you install your ipod in the console, No running cables, no taking the interior apart ( except for the console )

This is not the voice of experience speaking, i'll let you know how ab does with his DIY Santa Clause (ab) found me