Finished populating the new board today. It's sitting on my bench right now with a blinking LED, so that's a good sign! Still got a lot of testing and verification to do, but it's looking good so far. I need to do some programming to really test out the board, so that's where I'm at now.

Pictured below is the new board next to the original Toyota/Lexus board

Picture above is the new board installed in the inverter. Everything plugs in just like it's supposed to!