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1. No downside at all to that. Only way I've ever done them.
2. I would install wallboard before installing your mud floor. In fact, I personally complete the tiling of the ceiling and walls, except for the bottom row, and even grout them before installing the bonding flange drain or mud floor. One of the big advantages to the direct bonded waterproofing membrane system in my view.
My opinion; worth price charged.
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