Our Jack and Jill shower will be tile and although I don't have any children that will be sharing the shower, I'm considering any future family that might. The plan is to build TWO niches aprox. 10'X6" with one middle niche aprox. 4"X6" for soap or razors. The idea came from a nice fiberglass insert that has niches on both corners. If anyone has a "working" Jack and Jill shower and would like to chime in whether this seems practical or overkill, I'd appreciate it, as well as anyone with a design opinion.