A construction block unit includes a construction block and a lid. The construction block includes a bottom plate having a shape, a sidewall extending perpendicularly from the bottom plate at an outer edge of the bottom plate to form a container configured to receive and contain a weight, and fasteners coupled to a top edge of the sidewall opposite the bottom plate. The lid has a congruent shape to the shape such that the lid is fastenable to the top edge of the side wall via the fasteners to enclose the container. An interlocking portion of the construction block is shaped to receive a corresponding interlocking portion of a second construction block by vertically sliding the corresponding interlocking portion into the interlocking portion, interlocking the construction block and the second construction block to prevent separation by a horizontal force.