Fabricated a tray for the GMU11, Installed on the back deck with 4 pan head -3 rivets. There are none of these in any of the Van's supplied hardware because all the -3 rivets vans uses are flush head, but I find these invaluable for stuff like this. Before I riveted the tray in place, I squirmed my way into the tailcone for hopefully the last time and secured the wire run that goes back to the magnetometer and elevator trim. This bundle is routed via stick on wire tie mounts that are glued in place with E6000 adhesive. The wire ties are on standoffs so that the bundles are elevated slightly. I'm not worried about chaffing since they're sleeved in snakeskin anti-chafe, but I want them off the floor in case of potential water intrusion back there. I was a little concerned about magnetic interference while the trim motor is running, so I temporarily attached it. and redid the magnetometer check. With the wire bundles run together and routed as shown in the pictures below, and with the trim servo running, I was getting somewhere around 7% of max allowable interference. Also, that was with the magnetometer tray attached with steel clecos. Good to go. The CanBus terminates at the GMU11 and they left it long to account for routing variations. Ended up with the bundle being about 2' too long back there. Simple to modify since it's the end of the road and doesn't continue on anywhere else from there. I cut to a more reasonable length and re-terminated, including a new shield ground via solder sleeve. Left enough for a good service loop, and secured everything down. Re-did the magnetometer check. Without the steel clecoes holding the tray in I thought it would be better, but amazingly, it actually got worse. 24% of max magnetic interference. Oh well. it seems like it's going to be well within tolerance. The only thing I haven't done is turn the strobes on because there not hooked up yet, but that wire bundle is nowhere near the magnetometer so I can't imagine it being a problem.