Hey Gerard,
I love the idea of the bathrooms at Collinwood (just because we never saw them doesn't mean that they weren't there--and you know that Liz had a TV in her bedroom, always just out of sight--she would retire to her room "to rest" at a certain hour of the afternoon and watch "As the World Turns" and "Guiding Light" while enjoying a few treats from a box of chocolates)--being equipped with plumbing for the bathtubs through which sea water ran, like the bathrooms at the Astor place, "The Breakers," in Newport.
G.