This was custom made by Sandy Jackson, a glass artist in Denver, who can be found on the internet (Im sorry I don't have her contact info with me), and we had the seat made longer on each end so they are could be supported by durarock and support boards behind the tile. the led lighting was installed from the back side of the shower under an adjoining vanity cabinet (we were fortunate to have back to back bathroom walls). Also the led light is encased in plastic and watertight. I hope this helps you!

by the way, the artist that made the seat for me was found in Denver.

http://www.sandyjacksonfineart.com

It was pricey, but not out of reach for most home owners.The install required that we ordered the glass about 2-3 inches wider than the dimension between walls and we rested it on durarock and 2x4 supports and liquid nailed in place. It was tiled after installation to appear as if it were floating. I would have to refer you to Jonathan Young, the contractor who did the tile work for additional information on waterproofing etc. But you can email me at christayoung@comcast.net for that info.