Authors - Singh and Sooch in 2004 studied the economics of family size biogas plants and compared three prevalent models in India. Among KVIC, Janta and Deenbandu models, they concluded that Deenbandhu model was found to be the cheapest and most viable model.
About your question whether Dheenbandhu model of gas plant is widely used in India, pls contact Dr. Prasad Deodhar, Director of Bhagirath, Kudal, Zarap, Maharashtra. Contact number 02362 232 295
The Spoken Tutorial series on Construction of Biogas Plant was created with the guidance of Dr. Prasad Deodhar.
Also, if each family in an entire village gets a Biogas plant constructed then definitely it will help the mason in terms of more work and more income from his own village and also from the neighboring villages as well.
Let me know if you have any further queries.