That's a bit too open
Q
That's a better version for the landing. The studs can be 70mm to match the stringer and the slats can be fixed front or back or even laying flat.
alternative slat arrangement
or thinner slats
similar , a bit more open
squares would be an option - but??
that's how the stair balustrade could look like
I only added this photo to show how the slats look like in white
this is a different approach: a metal frame with the coloured pieces like your white kitchen fronts
not quiet right, but one could combine this with the previous photo
this could be the landing balustrade with vertical slats
vertical slats in white
this could be the stair balustrade version with vertical slats
balustrade and cupboards in white to match kitchen finish
a metal version
metal stair balustrade with verticals
or metal with horizontals
That's a bit too open
Q