Those are RGB lights, opposed to a single color LED. Without investigating, I'd assume people are swapping out the factory LED with their own color or RGB.

RGB will most likely require new wire runs to each location. It will also need some form of controller.

The system above sounds solid. If you are looking for counter arguments .... The factory Kickers, at 75w, would likely deliver similar to the JL. It wouldn't match the look of the rest of the speakers, though. You could "get away with" doing a JL400/4 on the interior speakers if price or amp rack space is an issue. I concur with MLA on the sub wattage. Overall, it looks good, though.