@chefwong: "Caulk - it will NOT match up in sheen or texture with any of the grout lines...this is a poor idea . No offense for those suggesting it -...
I would use a pressure treated bottom plate, with tar paper under it - to avoid direct contact with the concrete floor - secure to the floor with lag...
You can get drop-in tubs that have a tiling flange on three sides. The outside rests on deck wall you build and tile - but water doesn't get on that...
I want to install a Toto wall hung toilet, that requires a 2 x 6 wall. I'm planning on making another 2x4 wall and attaching it to the current wall....