Mine is in a cupboard on a shelf in our wet room but it's only about 20cm off the ground so could well not be a "shelf" as such and more like a plinth. I will see if I can work out how it was constructed.
18mm ply on 2x1s on 200mm centres. It is shelf-like in that it is not supported in the centre, ie, it could have been 100cm off the ground with other shelves under it.
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