I absolutely love all the tech that he used with the exception of the solid waste line. I can only imagine having some stranger in your house flush the wrong thing down the toilet and needing to pull that entire center hub apart to get to the debris. Then the need to sanitize it, reassemble it, and then pressure test it. Having solid waste turn 90 to get into that gate, travel up to 180° to get to the other gate and then do another 90 to get out sounds like a nightmare.

I think I would have left an open 6-in vertical hole in the middle of that hub, brought the PVC straight up through it and made it to the rotating system through a 45° 4-in with a couple of sealed bearings mating the 4" the 6"

As it stands if there’s a clog in that thing there’s no way you’re going to be able to snake the line.