I think this is the type of stair you will have. A window at the top for light is nice Railing at top Tricky design with window at top

Already you have left space for 18mm thk single glass.. to insert inside the hollow gap.. A;so a electrical wires in been kept on top, i dont know how u where u wanna used that for, there is no sandwich type glass space over there... Wood u hav already used for panelling & u r looking for glass.. wat type to take... My suggestion will be, u go for clear toughened glass, so that on one side u can fix film, ,,, so that any time if u feel like to change the design u can. but if u for for designer glass or decorative glass, which will not alter later, that will be one time large investment for u ,,, But changing the film will not disturb the entire partition and glass , only reasonable price u can change the entire film as per latest trendz

Rajesh--I would consult with a designer/architect in your part of the world to correct the reiling deficiency. I cannot speak to building codes in what I am guessing is the far east, but your local architect can. Attachment of the railing, to the floor and to the stairs, in terms of rigidity and support are important, as the rail will slope by the steps, and need to transition to a straight rail at the landing, and terminate into the white wall at the landing. Also, the architect can verify that the steps meet codes in terms of rise and run and the gaps btw. the steps, which would not pass code here in the U.S. I cannot see the while inside wall as you ascend the stair, so all I can suggest is installing a nice piece of art, possibly a triptych, of something culturally fitting for your part of the world. I wish you well in your design pursuits.

Tsilanko, I would always recommend professional installation where needed. But what I am doing here is suggesting that WHEN you are planning to build or renovate, to consider how your plans will affect you in 20 or 30 years time. Split levels are very hep when you are young. A kitchen 3 steps down at 30 is rarely a problem, but might be a hazard at 60, or, as Marjie1059 suggested, if you break a leg. ... All my parents' homes were terrible for old people. They were forced to move to a bungalow in extreme old sge because the location and design of their home was more suitable for an active young couple with a large family than for an elderly couple with stroke disabilities. I would not want to move again, so my present home has features built in that make ageing in place simpler. Mostly small changes, like grab rails, and lever handles on doors and faucets. A major disability suddenly suffered requires major changes if permanent. I did look at this because it came up in the discussion, but if you look at the heading, Planning for Disability, it means just that. Plan ahead so you don't have to make expensive changes later on. But thank you for your advice, yes, major changes are not in the DIY domain.