i would guess anywhere from 10,000 to 15,000 judging from the size a 16×32 cost around 3,000 to 5,000 and i’m sure its a concrete or gunite pool because of how big it is. could give you a better idea if i had a better idea of what the pool looks like

Depends on how well you want the job done.

I don’t know the cost but if the walls of you pool are reasonably firm you might get by with just a plastic liner.

This may do the job & not cost too much.

call around to local contractors that service pools. Hopefully you can get a free estimate