Build a shower stall with no door or curtain?

I'm thinking of an L-shaped shower, or would it need two turns to keep the water in? A sloping floor? I'm anticipating the need for a shower seat for future medical procedures, so I think it might need to be larger than a normal shower. What kind of floor base could I use? I don't want to be dependent on periodic upkeep to keep the shower waterproof. What's the best materials to use?

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