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^^I can't really tell; but, I think those are laminated wood treads/landing. Laminated wood, properly anchored, is a very acceptable structural element.
Well, many stairs have no risers. And, since it appears to be a residential stair; and, probably not one of the building code required access stairs, it is not required to have handrails. IMO, that is a big issue, but many clients prefer no handrails on "grand stair cases"Sure. That's not the problem. There are no risers, just empty space, and no bannisters.
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