Shelves/Wardrobes:
can be of plywood n laminate. it could be both sides laminate or only on the front. or veneer. there will be variation in cost accordingly. u can also have glss shutters. Approx cost range 1000/- t 1200/- per sq.ft.
Doors:
I seriously think all the doors should be replaced. Also give a thought abt the tiling n sanitary fittings in the toilets.

I hope this answers ur queries. I would also like to know about my role in the project, regarding the design , execution,.........

False Ceiling:
It either be of gypsum. We can have a recessed ceiling as per ur suggestions but the ht. will come down n if u have multiple lights from a single switch ( like in the pic) we may have to rework on the wiring a little.
It can be of any desired colour.
However pl note tht it will be difficult to change the fan point.
Le me know which areas u plan for false ceiling. If u need multiple light points on ur ceilings then u will have to go for false ceiling in those areas.
It also helps in reducing the load on the a/c as the ht. is cut down.This works out to be about 50/- to 75/- per sq.ft.

Flooring:
As suggested the flooring in the common areas can be of wooden laminate or wood which would differ hugely in their prices.
We can work out a pattern as reqd.
Wooden laminate 12mm to 15mm thk. - 100/- to 300/- sq.ft (depending on the selection- teak, oak, pine, rosewood, etc.)
Wooden flooring 12mm to 18mm thk - Teak n rosewood in the range of 600/- n odd
others between 400/- to 500/-

Hey guys,
nausheen mentioned to me about the quote for the kitchen, which is not possible unless u guys are ready with the detailed working drawings. so, have u decided on the final design?
Note:
Siince ur kitchen is quite small, accomodating the breakfast table is a little difficult.
The idea of cutting the slab for the fridge is ok. but we need to check out the elec. point for tht.
The overhead shelves could be made out of plywood or aluminium as in the pic.
The bottom shelves n drawers can be of plywood n laminate with the necessary metal trays.
This can be worked out at the rate of about 1300/- to 1600/- per sq.ft.