Bath venting w/ horizontal stack
I have a small ranch house with a basement in SW Mich. I am in the process of a major bath remodel, meaning that walls are being moved and fixtures are being rearranged. At present, there is easy access to vents running through the attic, and to drains running across the basement ceiling.
Unlike typical drawings, there is not a continuous vertical stack from the roof through the basement floor into which branch drains tie. Instead, the 3" stack ties into a 3" horizontal drain in the basement ceiling, downstream from one of the toilets. The drain exits the house fairly high up on a basement wall.
For the remodel, the easiest way to conceal the 3" stack is to have it come down a wall at the upstream end of the horizontal drain, where it would attach via an upturned Y.
Hopefully, my feeble sketch shows the idea.
The toilet and other branch drains would enter via upturned Y-and elbows. The second bath would have its own 3" branch with separate vents.
Is this layout, with the stack vent at the upstream end, acceptable?
Thanks for your help.