Here's the final product. I rounded the front edge and painted it black. Splitter and hardware adds 15lbs to the front. Came out ok, I should probably ditch the OEM undertray and drill the bottom bumper mounts direct to the splitter. The very ends of the splitter aren't as solid as I'd like, but ok for now.
It also sits low, about 85mm of clearance to the ground. I'll need to add some delrin pucks to the bottom or this thing won't last very long. Or potentially add some ride height to the front.