Custom Building help

Has anyone tried building custom staircases? I want to build a gentle staircase on the front of my building, kinda like the below but I can't figure out a way to do it.

 
HI use the roof molding stone flat -in building attachments, u can place one above the other stepping back, then use the other two roof molding left and right for the edges and then the new pillars for the square stones, that should work ok
 
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