You might find the Garum Project
thread interesting. Sadly it never materialized into reality for Creamy, BUT there are links to some garum recipes in there.
I'm a big fan of the Punk Domestic's blogsite. It's an aggragate site of links to recipes for all sorts of fermented foods and beverages. They have two DIY soy sauce recipes here
I'm about an eighth or maybe it's a 16th of the way through "on food and cooking"....it's a massive tome.
Have you seen his Harvard food and science lectures? They're all on youtube. He usually does the first lecture of the series.