I have revised my instruction page with pictures of routing the power wires behind the airbag extension in the right pillar. The only tool needed was a T20 screwdriver and a bit of electrical tape to bundle the power wires with the existing wire bundle in the pillar located just behind the airbag. No changes to the original install were required other than removing the pillar cover and shifting the wires slightly. see revised instructions
https://www.eyephysics.com/BMWG30/bmwg30.html