All of the aero parts you've mentioned are parts I want to do, but probably won't be able to lol. After seeing that Silver track GT I want mine looking something like it! I think the splitter will look a lot better way finished, but one thing is that the bottom of your lip kind of slants up toward the middle, I'm guessing you'll fit it so it obviously points slightly down when the car is in the floor? May just be the picture making me think it's pointing up tbh!