Circular Stained Glass Skylight

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When I bought my 1905 neo-French Renaissance house, it had a light shaft that ran vertically from roof to basement, with a skylight on the roof and tiny windows that opened into the two windowless tiny bathrooms on each floor.  Every time it rained, brown goopy stuff oozed into the two bathrooms.  The light shaft could not be repaired because it was too narrow to climb up to fix, so it had to go.  We repaired the skylight, which is now over the tub in my master bathroom.  The guest bathroom next door, however, was going to be windowless, so I had the idea to put a circular interior stained glass window into the wall between the two bathrooms, to let in light from the skylight into the guest bathroom.