Sent the mount back over the weekend, so I'm looking for things to do to keep busy this week. One of them is to mount the outlets for the overhead plenum forced air scat tubes, and to put in the snap bushings for the wiring. The bushings will need to be sealed after the wires/cables are run. I also riveted the upright support. I forgot to do this befor riveting on the Cabin cover, but after cutting the openings in the bulkhead for the Scatt tubes I was able to get my fingers in there and to put a small washer in the back side of an LP4-3 rivet and pop rivet it in place.
Both ducts in place
Added a couple of Snap bushings for electrical wires and coax