Shoot, I wish I could help, but your questions are too specific and I am clueless. From a subsidies perspective I do know however that financial assistance at 3% or less interest per anum is easily available from state banks. But yes, you do need proper documentation in terms of building plans etc. Also available is subsidized electricity. Not the same rate as available to subsistence farmers but still way lower than urban and industrial rates. Some state governments also have subsidies on borewells and other irrigation systems. Solar powered systems are available at upto 85% financial assistance at almost zero interest. Your best bet to figure this out would be to hire a local consultant to walk you through the process. Apologies for the sparse info. Good luck.