I want to add a shower stall to 1/2 bath. The 'full bath' bath tub is directly on the other side of wall. The washer/dryer is currently in the 1/2 bath, but changing to stackables would eliminate the need for plumbing and electrical changes to move them. In the 1/2 bath there is a dryer vent and floor to ceiling bumpout, which I guess hides pipes. Can I add a small shower, maybe the half oval, to the existing plumbing from the bathtub?