Drain/Vent Layout - New Const

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Location
Michigan
2.5 bath house
Main floor master & 1/2 bath
2nd floor full bath

The master seems straightforward: WC downstream of shower, downstream of tub, downstream of lavs. Wet vent a big loop and run the vent up & out at the lavs.
The 1/2 bath is a WC with the lav wet-vented (I think, depending on the upstairs)
upload_2021-11-19_13-54-42.png




The upstairs bath is a tub/shower downstream of the WC and the lav upstream of the WC. Shown as an inset-overlay on top of the main floor:
upload_2021-11-19_13-55-29.png



Question (aside from if there are any glaring errors, of course)... should I run the upstairs stack where the 1/2 bath vent is? That would serve as the drain from upstairs and the vent from the 1/2 bath. But that makes the entire 1/2 bath wet-vented through the upstairs bath, correct? Any issues?

Thx,
Dave
 
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