This is an example of converting a bathroom into a wetroom. A bath was removed, a new large electrical mirror fitted, a wetroom installed. In addition to this we fitted two waterproof 12V downlights in the shower + an illuminated recess under the shower.
There’s a dual shower with a ceiling fitted shower and a hand held one. The controller is fitted before entering the shower (so the water is warm before getting underneath) The tiles in the bathroom have been completely changed to accommodate the shower and new downlights fitted. Some plastering/painting was necessary for the ceiling.
So it’s a lot of work, but considerably less than redoing the whole bathroom.