A metrology frame (250, 302) having a reference axis and comprising a carriage, wherein the carriage is structured to include: - a housing base; and - at least one retroreflector holder affixed to the housing base and configured to receive thereat at least one optical retroreflector (260A, 266A, 274A), characterized in that the housing base contains a set of fiducial structures and is dimensioned to receive and removably hold thereat an optical workpiece such that at least one of a first spatial position and a first spatial orientation of a first reference point of the optical workpiece is in a first pre-defined dimensional relationship with respect to the set of fiducial structures, the at least one retroreflector holder is configured to receive and removably hold thereat at least one optical retroreflector structure (260, 274, 328) such that at least one of a second spatial position and a second spatial orientation of a second reference point of the at last one optical retroreflector (260, 274, 328) structure is in a second pre-defined dimensional relationship with respect to the set of fiducial structures, the at least one optical retroreflector structure (260, 274, 328) comprising a corresponding optical retroreflector (260A, 266A, 274A) of the at least one optical retroreflector (274 A), the metrology frame (250, 302) further comprises: - a support base dimensioned to support the carriage attached thereto such that the at least one retroreflector holder is separated from the support base by said carriage, and - at least one bearing cooperated with at least one of the carriage and the support base and configured to moveably vary a least one of a mutual position and a mutual orientation of the support base and the carriage. - a housing base; and - at least one retroreflector holder affixed to the housing base and configured to receive thereat at least one optical retroreflector (260A, 266A, 274A), the housing base contains a set of fiducial structures and is dimensioned to receive and removably hold thereat an optical workpiece such that at least one of a first spatial position and a first spatial orientation of a first reference point of the optical workpiece is in a first pre-defined dimensional relationship with respect to the set of fiducial structures, the at least one retroreflector holder is configured to receive and removably hold thereat at least one optical retroreflector structure (260, 274, 328) such that at least one of a second spatial position and a second spatial orientation of a second reference point of the at last one optical retroreflector (260, 274, 328) structure is in a second pre-defined dimensional relationship with respect to the set of fiducial structures, the at least one optical retroreflector structure (260, 274, 328) comprising a corresponding optical retroreflector (260A, 266A, 274A) of the at least one optical retroreflector (274 A), the metrology frame (250, 302) further comprises: - a support base dimensioned to support the carriage attached thereto such that the at least one retroreflector holder is separated from the support base by said carriage, and - at least one bearing cooperated with at least one of the carriage and the support base and configured to moveably vary a least one of a mutual position and a mutual orientation of the support base and the carriage. - a support base dimensioned to support the carriage attached thereto such that the at least one retroreflector holder is separated from the support base by said carriage, and - at least one bearing cooperated with at least one of the carriage and the support base and configured to moveably vary a least one of a mutual position and a mutual orientation of the support base and the carriage.