Spending a good deal of time sorting out details of the fresh air vents and heating setup. There is a lot of feedback that the standard configuration doesn't provide very good heat/venting to the back seats. There are also several online videos (ex. Evan's) showing how they have modified the standard option that are very helpful. This is one of the few places I plan to deviate from the factory plans. Comparing notes with other builders as well to see what they are doing in this area. My kit had the older metallic butterfly shutoff valve so I ordered the new one that is depicted in the current manual as of Jan 2023 (part number B11-543-85C and bracket CB-BKT-014-X-X). I plan to use the Aveo Air Maxi eyeball vents rather than the stock ones from the kit for better flow control (still need to confirm these are drop in replacement sizes). Because I plan on separating the vent and heat flow paths, there will be eight eyeball vents total. Two heat in the front center channel by front occupants legs, two heat in the rear floor. Two fresh air in front panel from naca ducts and two fresh air in the normal spots in the rear inside skins. For the rear fresh air vents, I am investigating if there is enough room to run a 1.5 inch sceet tube down the side channel vs. relying on a perfectly sealed side channel. The sceet tube would be malformed in the run and the 90 degree turn to the eyeball vent may not be possible so this option is still being researched. It seems like this may increase the limited airflow to the rear with more directed flow but TBD.
I got the heat exchanger out to review and also opened enough to wedge in the bottom base plate for the duct tubing connections.