I wouldn't put any water under there because of potential mould issues (in fact, there looks like there's a bit of mould already -- is there?). You could tile the bottom of it and put a strip of LED lights under the glass. What did you have in mind when you initially thought of the idea?

http://www.dream-kitchen-backsplash.com/stainless-steel-backsplash.html#sthash.WylmRsLc.dpbs The Benefits of Stainless Steel: Easy to clean Unaffected by heat Attractive Lasts for a lifetime Does not corrode or get darker with age The Downsides of Stainless Steel: Expensive Can be dented This article did state that the gauge (thickness) of the steel used, determined how easily it might dent... Can be scratched May require polishing to rejuvenate it's luster - See more at: http://www.dream-kitchen-backsplash.com/stainless-steel-backsplash.html#sthash.WylmRsLc.dpuf

I have some suggestions if you are thinking budget friendly changes. Make a photo gallery with different size frames and arrange them parallel to the stairs, so you can enjoy each photo as you climb up. And for the area that will be on a level with your upper floor, try some pretty decal that will connect the photo gallery to upper level. And last, if you have budget add some beautiful hanging lights in the stairwell. Also think about repositioning your refrigerator.

Sir, What is the purpose you are planning to put these panels to use. Please be aware that GFRG panels are a good option for construction but they need a thorough experienced professional for installation. Otherwise they may end up being a costly affair. Thanks, Amit CORNERSTONE DESIGNS Bangalore.