Dear Mr. Gupta,
Costing is very subjective matter and it entirely depends on what you wish to grow and which elements of nature you have to control. For example if you wish to grow Strawberries year round then it can cost you upward of 1.20 cr per acre while growing ginger may cost you about 30 lakh per acre.
Please do realize that hydroponics is just a tool and thus I would first suggest you do a research on the crop that you wish to grow, it's market and what benefits hydroponics can bring to this crop. Once you are sure of the crop, then optimum hydroponic system can be designed.
Take a look at this strawberry project of mine...
YouTube - straw berrry in poly house 7/12
Hope it helps.
Best Regards
Atul Kalaskar