Just a quick note to say I’m back, and I’ve found the closest thing to the kind of aquaponic system I want here: http://bioponica.org/biogarden-and-incubator/
The system itself replaces the food input for biomass and other readily available stuff (like pee). I’m keen, and I have been corresponding with the company about getting plans.
This could be linked up to so many other integrated systems it isn’t even funny.