Got a estate from West Shore homes
well, now that in know what your fixing on doing
here is a thought
when my mother in law (who lives with us) got out of the ICU back in december, i had a "door" installed in her bathtub
it cost around $800 installed, i believe and we love it
with the door installed, the kids can still take baths and run the water up as high as the upper drain
but with the door removed, the threshold to get into the tub is only 12 inches or so
Cleancut Wide White Convertible Bathtub Conversion Kit-C-W-W - The Home Depot
it may fit your needs