to place the shower head on an end wall that will be, mostly, glass, I was thinking of hanging a partition about 20" down from the ceiling and 30" long, the width of the shower, and 4.5 inches thick, ie 2x4's with sheet rock. the partition will contain the shower head supply plumbing.
the shower valve will be on the long wall.
was trying find something like a box that I can place on the ceiling, unless there is way draw such a "hanging" wall