Kaptan, for gross calculation civil engg cost will be around 1200 per sq feet.
1200 x 150 = 1,80,000
Then you may want to tile up the floor (and put carpet later), ordinary tiles Rs 50/sq feet, tiling charges 11-15 per sq feet = 7500 + 2250 = 9750
Acoustic treatment - Now this can vary widely. A basic ceiling will cost you 10 to 12K.
Add in bass traps, sound absorbtion panels = 15 to 20K (can be lowered using DIY).
Recliners/seating : 60 to 150K (again no upper limit)
Lighting: 3K to 20K.
AC: 30 to 45K (average).
Add in sound equipment, projector, screen, electronics. Depends on how much you want to spend.