Drain pipe blocking shower installation
I would add another framed wall, adjacent to the one that's there, that's just 3'0" high (except for where the drain pipe runs to the ceiling).  This would create an in-shower ledge that's 4" deep...great place to put shampoo bottles, etc.  One could also create a between-stud nooks above the in-shower ledge.  This idea, of course, would have me bring the shower forward to retain dimensions.