I just joined and noticed this discussion. I personally am interested, and would like to meet with you about it, and help with it to. Also, would like to make video of it for my website.
I've been looking at an ebook on 'Build A Biodigester To Produce Biogas At Home', that teaches how to do this. Let me know if you have heard anything about it. I am about to get it myself.
I think biogas/methane is a very good way to go, but the commercial ones are way to expensive.
Looking forward to meeting.