This is a do-it-yourself system. You buy the different parts from different vendors, the parts have been tuned to each other and it is just a matter of assembling everything in the correct manner and order. This is not a rush job, but a steady, keep-to-the recipe job.
There are several off-the-shelf options available, they are great, but costly. This option gives you the opportunity to tailor the system to your liking, and save some money as well.