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Awesome work that you'll enjoy for years to come. Do you have a ballpark figure about how much the project cost? I've been pricing pools like this for about $35-45k without the travertine of course :)
A few folks mention using wood or furring strips. I used a 12 foot drop ceiling track. The lights stick great and you can connect tracks for the length you need. Minimizes time on the ladder and are easily raised or lowered.