Yes, they are expensive but they are expensive speakers. Roughly $700-$800 of the cost is wrapped up into the speakers. Over the years I've been in both the audio business and the restoration business. I have built custom kick panels the old fashioned way on a router table with templates...
We recently installed a set of these kick panels from TPD hifi in my buddies truck. They come with Morel Nano speakers, sound amazing and no mods required.