I've been kicking this down the road in case I discovered I needed to route something else through there, but at this point I'm getting ready to install the fwd top skin, so it's time to clean up some of these little tasks. sealed up the wiring passthroughs with a plug of red RTV on each end. The way these are designed, there is a 'jelly roll" of fire barrier cloth that takes up the majority of the space. The RTV plug is only about 1/2" on each end, so that at some point in the future somebody needs to open this back up, they won't be digging out a solid plug of RTV. I also added a couple of nut plates and adel clamps on the fwd ribs. One to support the pitot/static lines & antenna coax, and the other to support a largely redundant ground wire that goes from the firewall stud to the forrest of tabs.