bro, I have a feeling a lot of members here are interested in this mod...a step-by-step guide (with pics) from purchasing the correct parts (with part numbers etc) to the installation and final testing of the gearknob would definitely earn you a lot of "likes" and benefits others for many generations to come..
nevertheless from my personal experience, it's one of the satisfying-looking mods done interior wise...congrats and enjoy your ///M5 shifter