Best Way To Do A Lanai?

[DRAWZILLA]

I also just use a railing wall made from the shower wall. By using a railing wall , I can adjust the top rail to be metal trim if need be, and the bottom rail as the bottom shower curb. If I need a pony wall next to the sink cabinet, then I use a p-solid for that. for the tile walls, I use a the material region tool so I can have it my way.