I love acrylic shower pans they clean easily no chance of a leak and look great .

why not tile?

so, outside the shower, what do you want for the floors? just one solid material?

These are solid surface shower bases.

these are pretty cool. cut to size

https://www.export.roca.com/rocalife/slate-shower-trays-surrender-to-the-resistance-of-stonex

If grout lines are the issue, why not do 24x24 or larger, porcelain tiles? they have some that have a bit of grip to them or a matte-type finish. You could get them to mimic the look of cement, if that's what you want.

for the actual shower floor, you could do larger tiles, such as these, and still have a non slip surface.

these, for instance, are a 24x24 w/ matte finish. fine for bathrooms

the issue is proper slope for drainage w/larger, solid pieces

This is actual Basalt, but you can find porcelain that looks almost identical

this one is porcelain w/minimal grout lines. and it's a matte finish, suitable for showers.

if you were doing a curbless shower, you could use this (but working w/the slope around the drain might be an issue. that's why smaller tiles are used there, or a preformed pan)

I also like the porcelain w/a terrazzo look. these are 24x24

or, go for the real terrazzo. many colors

these are also large format, porcelain, with a wood-look appearance

We are building and also trying to figure out what to use in shower. I will NEVER do a tiled shower again! I really want a solid surface for walls and pan but not sure what is the best route to go. Have you come up with anything yet?

Another vote for a shower pan. So practical.

@Caitlin Dunham I think microcement is beautiful in the photos I've seen. All photos were contemporary homes. Is yours?

It can be any color. What did you have in mind? I have been fascinated by the possibilities of using a cream color like stucco in a Southwestern home. So pretty with a touch of wood and turquoise. Sigh...

Or there's the industrial look... Could be dramatic. Or just plain artistic. Concrete can be stamped or brushed.

The guy that did my stamped concrete outside really was a bit of an artist. I hope you find one. Mine really knew his medium and showed me work gone bad and exactly why it did. I wouldn't let a general contractor use a subcontractor. I'd find someone with experience with microcement, someone skilled and artistic and give them FULL control of the process. 

I don't know about the microcement process or living with it though. I hope you get a response from someone who actually knows. If you find someone with experience, ask them for references. I let lots of people come see the work my guy did. Though I wish I did better at keeping up my patio furnishings and yard for those visits. 

I will say that if microcement is like stamped concrete, the process is VERY messy. There's this release powder that functions like flour when you cut cookies. It gets everywhere and is very slick. I would ask about the process and how they will prevent materials from "escaping" to the rest of the house.

Good luck. If you go for it, please follow up with your experience for the rest of us. And pictures...

The number one issue and failure point with any shower instal is a tiled pan. Uisng a prefabbed pan is bullet proof and also installer goof proof.

Plastic pans are not all teh same and are also all categorized as plastic but are made up of many different materials. You can have a pan made out of just about any solid surface material. Do some Google searches.

So called plastic pans can be rock solid with none of that cheap give of old $99 ones.

I know I will get backlash but stay away from the Schluter system if you have not done one before or had training. They are a complicated watrerproofing system that is really not needed for a residential standard shower. For a DIY any of the foam wall shower in a box systems are super easy to use and yeild great results as you eliminate seams and mixing of thinset.

We have microcement floor throughout our bathroom, as well as the shower walls and we LOVE it. No grout lines to clean!

@BPMBA would you feel up to showing pictures? Was the installation process messy? Have you any advice?