I roughed in a VERY small bathroom in the basement, then had an HVAC crew replace some old vents with more discrete boxes to create more headroom. Every inch counts. Problem is, the washer drain on the floor (bottom of image) is now directly under the box vent branch going upstairs (top of the image).
I was going to frame the washer drain inside the shower wall, but now I'm not sure how to frame it under a vent. If I shift the wall 5" to the left, it makes the shower too small. 5" to the right makes the shower bigger, but it puts the washer drain inside the shower. My dad had the bright idea of shifting right and building a corner shower seat over the drain to hide it inside the seat/wall.
Is that doable? Or is there a way to build the wall underneath the vent? Thanks for your help!