After moving in, we began using a Joseph Jenkins-style batch composting toilet system, but soon found that it wasn't the right fit for us, especially as it would not be safe to build a large, open compost pile (with human waste) in an area located in a vast floodplain. We were not inundated in the late-2011 floods that washed across Thailand, but we do have torrential rains during the monsoon, so having a compost + toilet waste pile in such an environment doesn't work.
We looked through many, many plans online and in a book called the Barefoot Architect, and drew up plans to build a continuous composting system instead. This is the view of the outdoor space below our bathroom. When we built the house, we asked the builders to put a hole in the bathroom floor, which can be seen in the ceiling in the image above.
An engineer neighbor/friend helped us start the walls so they would stand strong.
Landry drilling holes to put in a ramp for the initial droppings.
And a few half-pipes below to maintain air in a pile if it is compacted.
Above, the ramp is in, and part of the front wall is in. We recruited our construction-savvy neighbor, Uncle Preecha -- who was one of the main guys on the team that built our house by hand -- to finish the masonry and stucco for a clean look.
The door is attached, walls stuccoed and painted, and a vent pipe above, to keep air flow throughout the system. The vent pipe is painted black to heat the air, lifting the air up the pipe and creating a vacuum to pull air in through a lower vent on the side. It gives the needed oxygen to the composting waste and also keeps the system odor-free.