When framing the alcove do not add any extra space to accommodate the shower tub.
Gap above shower door.
Bypass or sliding shower doors are a common solution for a small bathroom or bathtub showers.
The door guy said 24 inches is a good number depending of course on your ceiling height.
Raised decorative metal panels that are designed to look.
The industry standard is 1 16 but i think even that is pushing it.
Tear off the tile of the existing wall in question.
The one i like twyford t4 or geo6 is 1 9m.
Consist of two and sometimes three panels that slide along each other on tracks.
The distance between the tray and the ceiling is 1 96m.
Some are nailed on some have adhesive backings and some slide into a notch in the door jamb.
The edge seal along that edge is probably there to hide the condition you are describing.
A small gap above the door can be filled by weatherstripping which is flexible and will conform to the gap filling the space up and preventing air from entering and exiting.
I think it is reasonable to reject the 1 4 difference in size of the gap between the door and fixed panel.
That s with floor to door top height of 7 feet.
There is an extractor in the ceiling about 50cm away from where the door will be.
Shower enclosure seem to come in 1 85m 1 9m and 1 95m.
Then build it out with 1 2 hardee board or durock and then cover it with tile.
It must be exactly 60 inches.
Between the thinset or mastic whichever you.
Ideal for wide openings with a typical opening of 60 inches wide.
Sliding door operation requires no floor space for opening door.
Question is will it be a problem only having a 6cm air gap above the door and side panel.
This dimension might be direct to stud or between two wall coverings.