I'm a ways behind you on my Mk5 Roadster wiring. Still in the "mess" stage but getting better as I work through it. You're making good progress with yours. From practical experience with the FFR A/C-Heat system, I'd caution you on a "low-medium-high" temperature control. A/C is almost always at full cold. But heat can require subtle changes to be the most comfortable. (I'm speaking for the usual occupant in the passenger seat. ) I'd recommend figuring out a way to have it adjustable rather than fixed points. I'm sure you've seen the pics of the switch panel in my Coupe. I have matching knobs and switches in a row. Looks decent and is very functional.