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Not knowing where in the project you may be, let me suggest that the first thing is to develop "appreciation for sanitation". You need to get people to "value" what you want to do. Otherwise the poor results will disappoint you.
Some type of "community involvement" is necessary. Let the community help you develop the plan. Let the community help develop the solution and feel it is THEIR solution.
Here is a methodology that may help you:
https://www.communityledtotalsanitation.org/page/clts-approach
The mechanics of the solution are the easy part. Hope this helps, and I hope you are past this point already. In which case we can start talking about solutions, from "arborloos" all the way to "urine separation", and "flushing toilets". 'nando