+Tiled shower walls
**Update** If you enjoy this instructable, checkout how to remodel another bathroom where I take on my upstairs bathroom.
Step 1: Planning the layout
The problem was that (a) the shower drain would involving cutting through a supporting joist (doable but more complex) and the a quote for the plumbing was about $800 since it involved moving two fixtures. Moving the toilet meant the shower plumbing would have to be installed on an exterior wall. Not only does this increase the risk of pipes freezing and bursting, but any repairs to problems with the plumbing would involve going through either the shower walls that I planned on tiling or the exterior walls of the house. It's best to install showers where the plumbing can be accessed though interior drywall (an interior access panel is even better). The project sat on hold until I could come up with a reasonable solution.
A few months later I had the revelation that if I changed the style of the door to either a bifold or pocket door, I would have enough room in the adjacent corner (the window extended into the shower space but I'll get to that later). Although the wall wasn't a load bearing wall, I was not super excited to tear it open enough to install a pocket door. I settled on a bifold door as a reasonable compromise. I drew up a mockup and was ready to get started.