I would like to build a staircase like one of those in the images below and am wondering if anyone knowledgeable here has advice on the approach? It's too high to make as a solid piece, so I assume that what you should do is first cast the actual stair section (dashed in my sketch) and then build walls around it and plaster them? That way, you could get a staircase like the one with the white side. How they made the concrete staircase is a bit harder for me to figure out as it doesn't look like there's any seam between the stair section and the wall - and it seems a bit unreasonable that it was cast as a solid "block"?
