Well there are three types on the engine cradle available depending on the type of mounting. Hydroforming is actually a cost effective way to mold the metals. The average cost of engine cradle is about Rs 700 to 800 plus the labour charge of Rs 200 to 300.
New Tata Nano with EasyShift is available at Rs. 2 lac (Ex-showroom, Delhi), and the final cost depends on the valuation of your car. So, first get the valuation of your car from authorized Tata dealer, so he can give you a final quote for the new car.