This was the starting point.
You can see the in-wall toilet tank here (TOTO).
The small valve to the right of the red tank frame is a slow drip to the in-floor trap. This keeps the trap filled even when the floor drain isn’t often used. It will prevent bad odor from coming up through a dry trap.
I’m the son of a farmer and although trained in engineering principles, I usually like to over-engineer things for additional strength.
Here we’re filling the walls with concrete to unite the bricks and reinforcing steel into a single structure.
The socket in the ground for the flagpole has a centering cone for the pole itself and is intended to be filled with sand around the pole to absorb some shock and movement.
The socket is surrounded by concrete at a depth of 3.5 feet.
Rebar in and footing set. Now to let it dry and then build it up.
There will be a special floor drain with a slow drip (source feeder copper line is covered by the blue sheath, and drain is covered by foil tape in preparation for the concrete pour). This way, the trap below the floor drain will not entirely evaporate and vent the sewer into the bathroom.
I want to optimize space in my shop. The tank of a commode adds an additional foot to the size of the bathroom in the place where I want it located. I intend to be ADA compliant with this bathroom so that it will fit a wheelchair. After some research, I found a Japanese toilet that has the tank embedded in the wall. The bowl is mounted to the wall and it leaves a very clean look. A narrow sink and waterless urinal (not shown) complete the outfit.