Build stair railing

Good day,

I am new here in the forum and have a question for the experienced masons among you.

As the title says and can be seen in the pictures, this is about my concrete staircase, which is covered with natural stone and is to be covered with vinyl in the end.

Since a pure stainless steel railing with horizontal bars seems too "cold" to me, I would like to build the staircase railing with aerated concrete blocks, plaster it, and mount a stainless steel handrail on top.

A friend, a trained mason, is not quite sure how to ensure stability in the concrete railing during construction, as he has never done such a job before.

His suggestion: to build 11.5 cm Ytong blocks directly on the stairs and then concrete the top with formwork so that the blocks are connected to each other. The rest would be covered with Styrofoam and plastered. Between the stair ascent and descent, there would be no gap as can be seen in the "finished pictures," because we will use wider blocks reaching up to the stringer.

I hope you understood my concern despite my amateurish explanation.

Looking forward to your suggestions

Not really my area, let alone that I would know about it, but this:

His suggestion: to brick 11.5 cm Ytong stones directly onto the stairs and then to concrete the finishing with formwork,

I consider very daring because, in my opinion, it would change the entire statics of the stairs. Unfortunately, I can't contribute more.

We will get that too but don't ask me now how that will be realized.

I'll join in.

Between the stair ascent and descent, there would then be no gap/space free as seen in the "finished pictures", since we will be using wider stones that go up to the stringer.

Uh, yes, I would expect that too. The solution in the "finished pictures" was planned that way from the beginning; however, in my opinion, you lack the space for it. I could imagine that the finished pictures show a drywall construction.

How wide is your tread? Can you chisel out the existing treads and risers before rebuilding?

On the side of the stairs or on the steps? Do you have photos?