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I am not too familiar with the shower proofing stuffs, but when my guys did the shower he used the old- school mud/mortar bed with membrane to do the base. Basically even if the tiles leak (or even if there is no tile at all) the base will catch the water and drain it away.
The base membrane also go up about 6"? from the floor, and the wall is lay over the membrane. So again even if the wall/tiles leaks, the water will runs down to the base membrane and drains away.
So no water ever touch the wooden frame.
I thought tiles grout are generally not not water proof anyway. So the shower floor & wall should be water proof even without any tiles on it.
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