So after we moved into Project Red, we had already determined that the tub shower was going to have to go . . . eventually.
Until the time came and the funds were saved up, we needed to make with what we had. Three tiled walls, which do look quite nice near the top. However, as the water from the shower has hit the tile over the years, it has clearly allowed moisture to be absorbed (most likely from non-epoxy grout being used).