Ebeneezer Geezer wrote:
Maybe this is, but I do not know the answer to it.

In order to remove a bathtub to replace it, you have to undo the drain. Now
can you do that somehow from inside the tub, or do you have to go through
from the ceiling below it. How the heck do you get at the fittings without
doing that? The tub goes righ to the floor at t he front and there is not
enough room at the back to do anything....

???


If you absolutely cannot make an access door thru the wall in the
adjoining room, then it is "possible" to undo the drain from
inside the tub.

Remove the trip lever/overflow faceplate.
Unscrew the drain fitting in the bottom of the tub.
How you do this depends on how the mfr made it.
If it has crosshairs, there is a tool to fit or you
can improvise.
Some mfr had 2 grooves in the side of the fitting.
Make tool to fit.
The drain fitting is probably very tightly screwed in
to the tub shoe (underneath) or is corroded in place.
Expect defeat.

Making all those surafces seal again to the new tub
will be a challenge too.

Of course, you can always cut the ceiling out.....

Jim