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

The metal stairs have metal cross members. Drill holes in them so you can bolt wood to them. This will you give you a nailing surface for the treads.

Dear Khurshid, Ask your builder if the double height terrace can be used for staircase. That way you can shift your dining table to the present staircase area which is just adjacent to your kitchen and still can keep it double height which will also serve as entrance area. Doing so you get more additional space for your living area and can have a more comfortable seating arrangement. Also by shifting your staircase to double height area makes more sense as you can still use it as terrace seating. You don't even need to have rcc staircase. Go with metal staircase with wooden treads. Which is space saving and looks super cool. Its a penthouse so do something out of the box. You cant do much with the structure but you have infinite possibilities in interior work to make it special. I hope that makes some sense to you.:) Regards, Ar. Ravi Prakash

sararahim123 What constitutes an adequate illumination level varies from person to person. What exactly do you require illuminated? If its simply ambient light you would have tiny lights as shown that throw light on the stairs itself. If a bit more is required you could consider adding a railing with a light under. If general illumination is what you are going after, but in a muted way, would suggest wall scones that throw light upwards onto the ceiling, diffusing the light.