I got lazy and did not even drill the door; you can feed the wires through the existing hole in the upper hinge plate, then through the b-pillar grommet. Routing from there will depend on your stereo/amp setup, I have a small bluetooth amp under the passenger seat. Also - I was able to fit...
I'm almost done installing a full set of Spenser's panels (still need to do the tailgate), and all I can say is they are 100% worth it. Great quality, great look, and Spenser is super easy to work with - he took the time over the phone to talk me through an install question I had.