That's is true,I've checked them out in the past. They have a very good package, but you are restricting to their pump setup.
In my build, I can have whatever pump I choose and how many stages, just need to build new mounts. I do have the same concept as you can see in the pictures that three channels running across back to the pump side, so the three scavenge ports are Close to the pump and need little amount of lines, but yes, you still need fittings. I think having fittings make it a lot cooler.