The home we raised our kids in was built in the late 60’s. Exceptionally well built wet plaster home but the tile surrounding the master bath tube/shower were loose. When we replaced the yellow cast iron tub with a whirlpool model we bought on clearance, I had simulated marble panels made. It took several weeks but was well worth it. They were exact fits, even accommodating the long wall being 1/4 inch out of square. Heavy too, I needed help setting the long piece. I think we paid $600 for the three piece tub surround and a panel to cover the tub front. But that was in the early 90’s.