This shower was fitted in an existing bathroom in a rented house. This shower uses a bar-type thermostatic mixer valve like the one pictured (right, from another installation). These are reasonably priced and widely available from different manufacturers, but fit onto standard-sized and -spaced connections so that if in future the valve fails and cannot be repaired, it can easily and cheaply be replaced.
The tray is laid at the floor level, which entailed excavating the concrete floor to accomodate the waste pipe. I generally try to lay shower trays at floor level rather than raising them on a plinth.
Before: the bath had seen too much Vim in its time and the enamel was worn away in places.
The bath was stripped of fittings and re-surfaced in-situ by a specialist. This is not real re-enamelling which requires baking in an oven (for which the bath obviously has to be taken away) but uses a particularly tough paint. Obviously the refinished surface is not as hard as the original enamel, but no more vulnerable than that on acrylic baths.
The outside of the bath was also repainted, then new taps and wastes fitted and the bath reinstalled.
I made up some wooden shoes to prevent the cast-iron feet of the bath digging into the Marmoleum floor the client had had laid. I also fitted a new WC (visible behind bath) and basin for them.