I am looking for some input before I have my inspection done. I am adding a shower to war was an existing half bath. I have redone all the pipe in the drains. In the picture the shower and sink are 2" and the toilet is 3" . The sewer main line is below the plumbing pictured. I have a 1.5" vent from the sink to the roof.
It looks like your toilet is upstream from everything else. I was reading up on vent locations for my install, and it seems the toilet should be downstream of the other fixtures (if possible). So I have a vanity hooked to a shower, hooked to a vent, then picking up the toilet last before exiting the crawl space. Not sure if this is right-I ain’t no plumber!!