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If you can raise it to 33cm , then I think that's a good move. 25cm is a bit too shallow, I reckon. It will look good, though, as a dry bed.
I'm really sorry to see how badly damaged your hands must have been for them to have fallen off altogether. I hope you are able to get emergency surgery and be back able to do manual work again very soon.
Mark, what are you using for coping?