Yep, still made. And yes, planning on a +20 year installed life. And with a mud set for fiberglass or acrylic, you do have a chance for that support not to be %100. Costly and Heavy as a bugger, but bulletproof over multiple lifetimes.
Which sort of brings me to the reason the OP is doing this remodel. A pet peeve of mine is houses designed to show and sell, but not really to live in. Jacuzzi tubs look great, but are not super usable on a daily basis. Tons of lost floorspace to all the framing and you almost have to sit and crawl over into the darn thing. Living rooms where there is only one place to put a TV and that's six feet up over the fireplace. Or on a wall that's filled with windows to backlight it. Grand entryways that require a scaffold and a skyhook to dust.