This kind of system has already been tested in parts of Africa, India and other parts of Asia with great success.
Innovations we are adding to it are a) ferro cement construction b) reusable formwork and c) integrated grey and blackwater WWG.
We are making what already works, even better
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https://www.slideshare.net/mobile/Oxfamgb/tiger-worm-toilets-oxfam-public-health-engineering-webinar this is a Tiger toilet project in Africa
Some science behind it
https://www.google.co.id/url?sa=t&source=web&rct=j&url=http://www.imperial.ac.uk/media/imperial-college/faculty-of-engineering/civil/public/ug/ug-final-year-projects/2015-16/E19---Liam-David-Noad.pdf&ved=0ahUKEwjr3JK01IrVAhWCNJQKHZD6CI8QFgguMAk&usg=AFQjCNGDvvpnCi3ZLu3Vg8NqWKmNu1xscA