I extracted the pins from the AHRS harness CPCs and routed the cords only to find the magnetometer connection to the wing root (white wires in Image 1) was too short, so the cable will have to go back. I also found that the CPC connector for that bundle was a 9-pin where the wing and bulkhead CPCs are 8-pin, so that will have to be replaced (only 7 wires in the bundle). And the CPC they sent me for P-1-1 was 24-pin when it should have been 37-pin. Oh, well, plenty to do and they are very quick about stuff like this.
I did get the OVM-28 from B&C and crimped connectors to it; it's the black unit next to the battery with black and yellow wires coming from it. I will fashion a clip to mount it permanently in that area (probably behind the contactor mounting plate). I also brought the master switch wires from both VP CUs (and realized I'd hooked the endurance busses to the wrong side of the contactor, so I had to change those). When I was done, I tested the Ground Power receptacle (contactor audibly worked, momentary charge before going to standby, no sparks or smoke!). and then I turned the panel on. Lots of red Xs since nothing is connected but the main units started up just fine. Yay!