You've piqued my interest.
Have you built one?
Where can I view the manufacturing instructions?
What's the max output in kilowatt hours, if known.
I've was once an assembly technician for a major wind turbine manufacturer.
I have tinkered with wet cell batteries, small hydroelectric turbines placed in a creek, small DIY wind turbines...produced enough electricity to charge a phone or led lights to see by.
I have done some initial reading of the literature on a similar process as you described but using one's home sewage as the methane source.
I was more interested for use as emergency power but now I am more inclined to look at producing full time electricity that can't be shut off due to my extremely low ESG score.