Looked back at my drawing this evening and realized I don't think I can vent the toilet coming off the horizontal. Reworked the drawing a bit and also tied the first floor lav vent in above the second story sink.
We're under IPC here and from what I've read there doesn't seem to be a distance limitation for the toilet vent...I may be wrong about that though. However, if I did want to vent properly - would my revised drawing be the way to do it? I didn't know if there was any danger is the toilet siphoning any of the other traps.
Thanks again for any help in advance.