ConstructionObject is only used by ConstructionRigs. The ConstructionObject is selectable only as the model of the construction item is being visually assembled, but its effects occur as soon as the ConstructionRig begins construction. It is used to implement footprints for objects currently under construction.
It is used only in mconstph.odf and this ODF should not be deleted (or the name changed), as the referencing is hardcoded for use by all ConstructionRigs.
classlabel = "constPlaceholder"
Does not have any special ODF commands.