If you're looking for a cheaper way to design your shower, this is for you.
Our shower is almost 20 years old. It was repainted black a few years ago and as the paint faded it looks so dirty.
For our new DIY shower we used:
*Shower base=depending on the size of your shower.
*Roofing panel for the sides= the same one we use on our roof, we used the white side. You can use corrugated metal sheets if you don't have one.
* We put 2 handle bars
*And an affordable shower curtain from the dollar store.

We bought CPVC pipes, elbows, fittings & couplings for plumbing.

Although we plan to add a door in the future.
It is now, a working shower, waterproof and cleaner as compared to the old one.