My elderly father in law is about to return to his home in Sequim after physical rehabilitation. He does not need a "no clearance" shower, but cannot raise his legs over the edge of the bathtub in his home. Does anyone have experience with the "walk-thru" conversion advertised by Bathcrest of Seattle? It appears in the photos that a chunk of the bathtub wall is simply removed (and finished edges applied) allowing a place to step through to the tub. The ad claims it can be completed in a few hours and would not be as expensive as a total removal and replacement Thanks!!