Due to a plumbing leak the tub and surround had to be removed. I have decided to ditch the tub and go with a shower instead but am not sure if I'm getting in over my head. Details>>> Townhouse w/ concrete slab. Wall in bathroom is a common shared wall w/ neighbor. The plumbing is somewhat...

I'm planning a new bathroom with a multiple-head shower. What differences in plumbing should I consider? multiple water lines or can they share a line? Should I increase from 1/2 inch to 3/4 inch supply?