I could sketch something for you if you give me some dimensions. I've built steel, steel and wood and just wood. The easiest way for a theatrical application is to laminate luan. Building up layer upon layer of 1/8" around the outside of the stairs. It is not fast, it is not easy. It takes a lot of patience and humbly, a master carpenter. It also requires quite a bit of room in a shop and a couple of folks or a whinch to move it around.
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