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The author of this HowTo biogas digester might be a good resource person : http://www.greenoptimistic.com/about-us/ "To construct a good biogas plant, you should not only respect the dimensions as indicated on the drawing but also follow the correct construction method. Hereunder, in a step-by-step fashion, the right construction method of the 2047 design GGC model biogas plant is given."

Lots of resources about biogas generation DIY

A Novel Design for a Biogas Generator in Developing Countries by Joanna Read A thesis submitted in partial fulfillment of the requirements for the degree of BACHELOR OF MECHANICAL ENGINEERING The proposed generator is designed to produce 3.2 cubic meters of biogas per day. This is the amount of biogas necessary for the daily cooking requirements an average family of eight people, the norm in Pabal. Initial conceptual designs are outlined and analysed by the use of a design matrix. The final design is also analysed and suggestions made for further improvements.

Potentiality of domestic biogas plants in China „ It was forecasted that the potentiality of domestic biogas plants is 150 millions on the basis of climate potential and social-economic potential by Some Chinese experts , that may cover of 55% of the household in rural area in China. It means that the number of biogas plants in use will meet the requirement of 20% of potentiality by 2010. „ If we consider the trend of rural economy developing in China, the potentiality should be modified based on two aspects: (1) Industrialization of animal husbandry with fast development speed；(2) the movement of traditional farmer from rural area to cities and towns. „ Approximately, the potentiality of domestic biogas plants in China is among the 80 millions mainly based on the national pig dung potential

Vinck Dominique. Les objets intermédiaires dans les réseaux de coopération scientifique. Contribution à la prise en compte des objets dans les dynamiques sociales. In: Revue française de sociologie. 1999, 40-2. pp. 385-414. This paper explains the importance of "intermediate tools" as mediator of social relations, how it embeder the links among parties. Really useful to justify our consortium and a DIWO Lab environment.

I don't know if he's right, but he is pointing some intersting existing debates