I did this tonight and it was very helpful, so thanks for posting. One issue I encountered is that the e93 pillar does not have the "button" for the SRS so I wasn't sure how to remove it the trim to get the wire behind it. I was able to run the wire between the pillar and the windshield and then snake it into the glove and it looks pretty good, but was curious if anyone knew how to remove the trim on the e93. Thanks!
2012 X5M AW/Black
2011 E93 M3
2008 E90 335i
2006 M3 Vert, 2008 e92 335i, 2002 M3 Coupe, 2002 330ci, 1997 M3 Lux