This module wasn't as challenging after I went through the plumbing system of my own model. I really understand why verticality matters so much now! I connected all the fixtures without too much concern. For the mirrored bathroom — I decided to mirror both across the x and the y axes since the bathrooms were mirrored that way too. This way, the piping can stay consistent — it just depends on how the vertical pipes are connected together. When placed in the BIM360 coordination space between the architectural and the plumbing system, we can see that the clashes happen mostly between the walls. This shouldn't be a problem as it's fixed onsite in real life.
However, after the structural element was introduced, there were quite a few clashes — I guess that's because I didn't know where the architectural elements were when I placed the structural systems. I didn't really know what I was doing back then when I was placing the structural model. This would be more of a problem as you would have to either go back and replace the structural elements (which would be a lot of work) or move the architectural components around. Lesson learned to look at the architectural elements (e.g. sinks and other plumbing fixtures before placing the structural elements)
BIM360 model: saved view called 10.5.A Exercise Plumbing Systems