Need to cut the hole in the baggage bulkhead for the return air into the evaporator. Spent a lot of time just making sure the evaporator was exactly where I wanted it and clamped it in place. Then made a couple of guide marks in the template provided by the AC manufacturer to try to align the bolt. Got everything where I wanted it and taped in place. I'll go through and double check everything before cutting. 2/9: Pulled the trigger and marked the centers of the holes in the bottom bulkhead. Then drilled them to #12. They lined up perfect with the evaporator holes - so far so good. Double checked the marks for the cut out and adjusted a little bit. Then took everything apart and cut the bottom bulkhead with the oscillating tool. Came out really good and straight. Reassembled everything and checked against the evaporator - came out quite good with just a little bit of filing. Cleco'd the upper bulkhead in place over the lower as it would be in the stock plans. Something wasn't quite right though. Based on the nutplate holes in the top bulkhead from Airflow Systems, the upper bulkhead seems to want to be behind the lower. I guess this makes sense as the lower bulkhead will be coming off more often and the upper will be more cumbersome to remove. Slept on it to think about how I want it to be. 2/10: Confirmed the orientation of the bulkheads on the 3D model that Airflow systems provided. Used the original upper baggage bulkhead to match drill all of the holes in both the new bulkhead and the rear fuselage buklheads. Jumping back and forth between Van's instructions and Airflow's, I cut the two wear blocks for the seat belt cable and then match drilled them to the brackets that Airflow provided and to the upper bulkhead. Will need to wait until I can prime to finish all of these. 2/11: got the upper bulkhead cut out for the evaporator. Lot of putting on and Taking off again. Cleaned up some of the nutplates on the side panel and co firmed final routing of AC hoses. Installed the nut plates at the front of the side panel. Then drilled all the nutplates for the upper and lower bulkheads. Going to leave the top two holes in the upper bulkhead alone until I figure out the airflow routing into the overhead console - looks like there will be conflicts. 2/12: Got the nutplates all installed on the fuselage bulkhead. After almost 6 months this section is finally done.