Elaborate wooden staircase Free 3D model

This 3D model was originally created with Sketchup 15 and then converted to all other 3D formats. Native format is .skp 3dsmax scene is 3ds Max 2016 version, rendered with Vray 3.00 Lemon step ladder, made with metal plate hidden between two plywood board, steps in processed wood, wooden handrail profile supported on 18mm twisted balusters