Classical wooden corner staircase with staggered steps

The size of the ladder without additional elements:
Width 2550 mm
Height 3500 mm
Length 4050 mm

3 color versions of balusters in the form of balls with materials:
1) black with white patina and contrasting thread.
2) black with white patina
3) white with gray patina

In the archive of the texture files 3ds 2011 vray and corona.