Wonder if you still have your VW Vert? I too am doing a hard wire for camera. The camera is already mounted via the license plate frame. We have the monitor wire running under the side edge of center console and under flip up rear seat, but then where do I go from there? The pass through is air tight...I dunno if that panel can be removed to run a wire through? I WAS going to go "wireless" as the kit allows me to swing both ways: hard wired or remote. Remote sucks because I keep getting interference.
Anyway, enough of my babbling, IF you can shed some light on running wire through seat back or some where in or around the pass through, it would be greatly appreciated.