One thing to consider is that there will be a moderate amount of solids. Mostly carbon and hydrocarbons. I'm thinking of a small tank with connected perf pipe, just like a septic system only smaller. Want this thing to be self-cleaning as much as possible. Mabe run steel pipe to the tank, let the gas cool and preciptate there, then stuff could run on down the perf pipe, which could prob be plastic. This would also give the bugs a range of temp, humidity, gas levels, etc., so they could find their ideal spot to grow. Agree that manure is a great source for bugs. Mabe a few shovels full of dirt from around a local oil or gas well? Bob, where is your Kansas homestead? I'll be in Oklahoma about 30 miles west of Ft.Smith AR.
Zeke