Nice work. Very cool setup. I like everything except for the need to use the Metra kit. That kit is notorious for LEDs going out in the display. Metra support is quick to respond but the only response they give for LED display going out is to flash the firmware (which isn't the problem) or replace the entire kit (which is generally out of warranty when the LED display goes dark).
Would be nice if there was a way to make your car PC handle all the HVAC controls and then have a custom dash kit made that looks better than Metra.