I don't see how forcing air over the rear of the headlights would be beneficial. Your far better off having the middle section only, then applying some sort of side barrier that would duct the air through the core. Even with the headlights covered, air will still travel around the core, especially if your IC pipes travel through the side of the radiator. It still helps, but a center section, like the OEM diesel, will be just fine. You won't see a dramatic difference without the sides of the core being blocked off anyway.
I said it before, the design will be simpler, cleaner, cheaper to ship if it were a center section only. Covering the headlights is a cosmetic design.
1/8th in aluminum that has 12 inches of unsupported length WILL rattle and vibrate with a car that has poly mounts. Putting foam tape in places to stop that works, but then I'm not going to spend 200 bucks shipped on a noisy non fully attached air diverter.
With that said, the design does look great though.