If I went with 3/4" plywood it would be fine to then butt the Kerdi band up to the tub apron and not worry about lapping it over the tub apron a 1/4"? If so, it sounds like that might be the easiest solution from a waterproofing perspective. It may cause issues with the toilet flange and transition to the hall so I will just have to decide which option will cause fewer headaches.
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Alex
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