Got the first 4 inch pipe run. I am not going to show every run here, just the core run. You will see other runs in future posts.
I am using 4 inch sewer pipe, it is thick enough for what I am doing and much cheaper that regular 4 inch PVC.
I used 2 small sheet metal screws to help hold everything together. I did not glue everything together, I want to be able to take everything apart if I need to.
Here is a shot of a Wye with a blast gate: