Before we could lay down the vapor barrier, Stefan and my Father built a half-height wall and installed the shower curbs.
The half height wall should lend some privacy to the toilet area. After constructing the frame with 2x4s, they covered it with durock. One thing they did do was to shim the durock on the top of the wall so that water will roll off the ledge instead of pooling on it. It has a nice slope to it comparable to the Styrofoam curbs. The whole thing was thinset in place.