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6 points
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That might be a good simple approach. I’ll look for outdoor plastic boxes that have a rubber seal. Maybe construction adhesive could attach tiles to it.
7 points
It’s the best approach, also for cleaning. Extra stuff like that in the shower gets lots of soap residue stuck on it and can become moldy or attract bacteria. People need to be able to clean it easily and that handle is not easy to clean. Also cleaning agents may cause the parts to corrode. A little sealed box will solve all of that.