Made a bit of headway. Got the water issue mostly sorted. Still not thrilled with the color and reflectivity... but at least it does more than glow, now, so I have something to work with.
Here's one section of the observation ring. They all look much alike; save for the view out the windows.
This is one of the exits onto the terrace. One north, one south, windows with purdy views on either side of the doors.
The area of the bottom floor where sinks and other such primping/hygiene areas will go. Through that doorway in the back will go the throne. Figure the penthouse probably doesn't need more than one toilet, so long as I keep the Tower kitchen staff away from the Mexican menus.
Here we have the bath. I was thinking Roman bath house, except in black. There will eventually be pillars and such.
Closer shot of the water. I kind of like the whirlpool effect, but I think the color needs adjustment - back towards white.
Unfortunately two of my ideas aren't panning out. One - the windows on the ring - aren't working with flat images of the outside landscape. I may have to try retexturing one of the planetarium domes.
The other was the aquarium. I had the idea that I could run it up, and have sky planes in place above the water. Brighter lights during the day, dimming at night. Sky planes are lovely little things slaved to the daylight condition of the wasteland. Unfortunately they were causing reflectivity issues with the water. I'll keep toying with it, although I may have to toss that idea and just try out the scripted color-shifting lights idea Herculine and I were discussing the other day.