The idea is for me to build a railing on the upper floor where the stairs come up. I am attaching a simple sketch of how it is intended to look.

The reason for a laminated beam at the top is to give the roof some support since it is a large room with long and low eaves (as a safety measure).

Then I had planned to attach the spindles to the bottom rail from underneath and secure the bottom rail with thick screws in the floor. One "pillar" (the left one) will stand against a wall and be additionally attached to it, but the right "pillar" is only attached to the bottom rail (the pillars stand on the bottom rail) and the ceiling. The same goes for the short middle pillar.

The top rail goes the full length (it would look nice if it could be split to allow the middle pillar to go up a couple of centimeters, but I assume it would affect stability quite a bit) between the outer pillars.

My question is: will it be stable enough at that length (320 cm), or does the middle pillar need to extend up to the ceiling for stability?

Sketch of a railing design with measurements, showing laminated beam for support, top and bottom rails, and vertical spindles.
 
It will be stable, but as you say, splitting the top rail leads to problems.
I don't know how you plan to attach the balusters at the upper end?
I usually take a thin board, like 15x70, and screw the spindles through it, then place the top rail on it to hide the screw.
 
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larsbj said:
It will be stable, but as you say splitting the handrail leads to problems. I don't know how you plan to attach the balusters at the top end? I usually take a thin board, like 15x70, and screw the balusters through it, then place the handrail on top so the screw is hidden.
Thanks for the response. Regarding the balusters, that sounds like a good method for attaching.
 
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