Steel deck

I want to have different layers in my design and have thought of various ways i can do this. I want to use steel deck as a platforms that actors can stand on top of but also use the area underneath it, perhaps to represent a bridge in some scenes (such as the prologue when Wong is waiting for the God to appear) ? I was looking at the different styles of bridges and I like the idea of using the steel deck but not actually hiding the fact it is steel deck. This is what the sort of thing I mean: