An alternative would be make a 3 sided cubicle that 'sits' on an upstand
tray .... if you use Respatex, then you have a very strong panel ... and
waterproof.
They do specific shower sized panels ... OK for standard tray ... but as I
wanted bigger oblong and corner trays in my build I used the standard
panels.

No tiles, no grout to fail ... http://respatex.co.uk/index.html

They also do all the trims, and you screw your shower door direct to it.

Just looked there are details sheets on how to build a showers on:
http://respatex.co.uk/shower_install.html