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Tom,
Thanks so much for your help and patience! Final design is pictured below.
http://www.xcix.net/plumb/final.jpg
The 3" stack was moved south to a wall where it could be streight from first...

I see your point. Shower p-trap is now turned to the internal wall, entering a vertical 2" pipe with san-tee. Above is vent tied to others in attic, below is combo to horizontal run, cleanout at end...

In general it in my impression that there can be 135 degrees of bends in a run before having to add another vent. What bends count?

My specific situation is a lavatory. The stub comes out of the...

I'm trying to plan DWV rough-in for a second floor "loft" space over a workshop space. Building was built about 15 years ago and never finihsed (interior). Upstairs "loft" is about 900 sq ft and...