Here is a set of some new sci-fi stairs I made in Blender and 3d-Coat.
3d and animation preview on Sketchfab (Rusty)
https://sketchfab.com/models/74c6f3b99c174b51b2a06266016c8a1c
3d and animation preview on Sketchfab (Not Rusty)
https://sketchfab.com/models/cbe87a9407b4499e98dd5289ef6dce42
The Sketchfab animation shows how the modular components can be assembled.
Test in Unity3d
https://www.youtube.com/watch?v=5t0S7uOB5Ms
Test in Unreal
https://www.youtube.com/watch?v=PfaigIrGFJw
In Blender
https://www.youtube.com/watch?v=fLRI5I0gNEQ