Dear,
Cost depends upon specs with which you like to go.
Detailed specs of each and everything from tile to very minor interior details required to have estimate. finishing costs after grey structure may vary from 1500 Rs/Sq ft to even 4000 rs/Sq Ft, it depends what quality you have in your mind.
W.r.t turn key, only labor rate shall be fixed if you want turn key. Project shall not be awarded on with material turn key with the scope of work you are telling as it will not be economical. Also its not possible that a single party have all the expertise from tiles installation to kitchen making then paint and polish so in my view even this will not be possible until you give it on turn key basis to any qualified contractor who have all the individuals teams. THANKS.