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I support 'going Green'...however, keep in mind, "Green" product companies are also in it to MAKE MONEY. Many of these things you can MAKE so much cheaper, with what you already have in your home. The investment in time to find them is well worth it.
If we were doing the stairs with the landing and wrapping, I like the way these are done with the windows over the landing. Could have an open wall area over the landing into the level (in this image it would be on the top right).