I know that underside is matte black but can anyone tell me where the paint line should start and stop

I believe its from the center of the hood out to and including the outer edge of the halo,from there its body color.

Let me refrase that, the black starts at the center of the hood out to and includes the outer edge of the halo at all four sides,the body color line starts at the underside of the hood skin where it meets the outer edge of the halo at the 90 degree point at all four sides, hope I haven't cofused you.