>>The bottoms of the fenders will be flared out to match the Prius V chassis
Ah, yep. So the bottom edge I have the same plan for. I was more wondering how you attached the top edge? I need to keep the fender edge flush with the cowl panel.
>>However, I still need to work out the pin-out differences in the connections.
Lucky you are an engineer. I've been trying to decipher the pinouts for my HVAC and it's way more complex than anything I've seen in the past. I've found that even from model to model there are changes that make some parts nearly non-interchangeable. My 2012 factory-nav HVAC system can not be swapped out for a 2012 non-nav controller. The corresponding wires do not exist! I did not expect such complexity. I've compared the wiring harness from the original complete Firebird to the one in the Lexus door and they contain about the same number of wires/connections. Crazy.
Do you have any updated photos?