OK, I will bite, what is a concrete shower? Inside, outside, application? Are you talking about a shower that is tiled, these are typically a concrete pan, and concrete board (or similar) walls with tile over top of the concrete board.
If you are talking about adding a walking type shower, there have been many threads on this subject, and there are many vendors that do this type of work. I do not have first hand experience so I cannot make recommendations.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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