I jumped back to work on the a/c. The Aussie configuration requires two supply and two return vents in the upper baggage bulkhead. I decided to fabricate a new aluminum bulkhead that is flat. The vents protrusion will be much cleaner. Ultimately, I'll fabricate an upholsetered overlay for the bulkhead to provide a much more finished look. Today, I made a cardboard mock up of the new bulkhead cover.