Originally Posted by jogr
...Local inspectors usually don't mind educating a homeowner as to the right way to do things (within reason). Give em a call.
That's great advice...at least the BI in our area at like this. They are less friendly if you put it in, it's wrong and you fight them because you "think" it's right. Just ask the BI when you have a chance, they have great stories.
FWIW -- My ejector pit is vented with 2" PVC. What size vent are you planning between the vanity and stool? When I did my house, a 2" vent with-in 6' of the stool passes inspection. With out seeing actual dimensions, you have a vent on each side easily with-in 6', it should be fine.
Which direction does your floor joist above run, that may change which direction you run your vents.