Modelling looks good, but i'm not sure about the textures, is it meant to be
metal or stone ?

If i see it right, the stairs on the side are moving stairs while the one in the
middle is fixed.  Usually moving stairs are made of ribbed metal, you could use
a marble/gradient pattern for the normal or an isosurface for that. 

Christoph

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Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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