I have a 60"x42" shower pan, with a 4" curb, which will be set in a righthand corner, and plan to mount the shower head in the lefthand 42" wall, with a fixed glass panel on the front 60" wall. I'm considering a 34"x72" panel, which leaves an opening of 27". Is that too narrow? Also, the lefthand wall with the fixture will be 78" tall, to match the panel height on top of the 4" curb. How high should the bottom of the shower head be? Is my plumbing wall going to be tall enough?