My mother has developed some mobility problems that make stepping into/out of her bath/shower quite difficult. She lives alone in a remote area and will not even consider relocating. So my alternative is to replace the tub with a low threshold shower. I would like any recommendations for manufacturers of multipiece shower pans/surrounds and installation experiences.

The bath is a small, utilitarian one in a klinker built farmhouse. It is the only one in the home. The tub is 5'x30", 1 piece fiber glass with surround.

I have experience in the relevant skills but this project needs to be done in a weekend. It's a 700 mile round trip from my home and 35 miles to the nearest home improvement store. So it needs to be a simple enough install that I don't waste 1.5 hours running to get unanticipated parts.

The requirements are in order of priority 1)ease of access for my mother 2) ease of installation 3)ease of cleaning 4) cost 5) esthetics