It only took about 5 months for me to get through the angst of trying to build a wiring harness for the ICOM A210 communications radio and PS Engineering 1000II intercom, but today I sucked it up and flipped the switch.
And it works!
Since the engine isn't ready yet, I couldn't test out the shielding of the harness and its ability to keep out noise, but I did flip on the strobes and all of the other electrical equipment and it all quiet as mouse. Then I transmitted on 123.45 and listened on the scanner in the hangar and things sound great.
By the way, I've recorded a video on how easy it is to install component and configure them using Vertical Power. I'll edit it down and upload it here in the next day or so.