When making boxes you need to incorporate braces to prevent
the side walls bulging. You must also build in low-level cross pieces
to prevent the box rising when
filled with earth.
Use short BlocX components to make short walls.
Use
BlocX4-3-4 to make interlocking "T" junctions.
The
earth will cover this brace and hold the box down.
Use angle plates to make flush "T" junctions like this.
