well i do trust him....but I m just concerned about the wallpapers....haven't really used them nor have seen anyone with that in the locality.....that's all....

Very pricey in many areas, and not necessarily an advantage. Hard to heat, cool, light and handle the extra-tall windows. 9-ft. is the added height norm, although one can always add additional volume with a peaked ceiling or similar.

Hello Rahul, If you want it to be a cassette AC, then it has to be 8'8". But if you opt for central air conditioning, then you can have the maximum height.

I was going to suggest the same thing as InspiredHome. Fix the false ceiling no more than 6 inches from the true ceiling. However you would have to drop the height of your wardrobe loft shutters, otherwise you will not be able to open them once the ceiling in place.. You can leave the carcass as it is, but replace the the shutters with a fixed panel from ceiling to about 8 inches below, and smaller shutters in the remaining space. The false ceiling can stop at the fixed panel above. That way you will not lose loft space