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

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I think this was just brick added to a wall so you should not need anything other than mortar but IMO this looks odd just put in the middle of a wall I would remove it

I completely agree with Rupal shah that different level on a single floor isn't advisable.Always Consider your family status and lifestyle.Especially if you have children,elderly or disabled family members. Nice sharing.