Fabrication assembly for automated metal fabrication on an elongate metal workpiece having a workpiece main axis, comprising: - a first track extending horizontally and linearly, defining a horizontal X-direction of the fabrication assembly; - at least one first fabrication robot (4a, 4b) coupled to the first track so as to be movable along the first track at least within a fabrication operational range along the X-direction; and - a set of rotator assemblies (5a-5d) arranged, at least arrangeable, on one side of the first track within the fabrication operational range and configured to receive the elongate metal workpiece with the workpiece main axis substantially parallel to the X-direction, and to rotate the received elongate metal workpiece about a rotator rotation axis substantially parallel to the X-direction, wherein the at least one first fabrication robot (4a, 4b) is configured to perform metal fabrication action on the elongate metal workpiece within the fabrication operational range when the at least one first fabrication robot (4a, 4b) is within the fabrication operational range while the elongate metal workpiece is received by the set of rotator assemblies (5a-5d) within the fabrication operational range, characterized in that the fabrication assembly further comprises a first set of trolleys (6a-6d) movable along the first track at least within a workpiece transfer range along the X-direction that at least partly overlaps with the fabrication operational range, the first set of trolleys (6a-6d) being configured to receive the elongate metal workpiece thereon with the workpiece main axis substantially parallel to the X-direction, wherein the fabrication assembly is configured to transfer the elongate metal workpiece between the first set of trolleys (6a-6d) and the set of rotator assemblies (5a-5d) within the workpiece transfer range substantially in a Y-direction being a horizontal direction transverse to the X-direction. - a first track extending horizontally and linearly, defining a horizontal X-direction of the fabrication assembly; - at least one first fabrication robot (4a, 4b) coupled to the first track so as to be movable along the first track at least within a fabrication operational range along the X-direction; and - a set of rotator assemblies (5a-5d) arranged, at least arrangeable, on one side of the first track within the fabrication operational range and configured to receive the elongate metal workpiece with the workpiece main axis substantially parallel to the X-direction, and to rotate the received elongate metal workpiece about a rotator rotation axis substantially parallel to the X-direction, wherein the at least one first fabrication robot (4a, 4b) is configured to perform metal fabrication action on the elongate metal workpiece within the fabrication operational range when the at least one first fabrication robot (4a, 4b) is within the fabrication operational range while the elongate metal workpiece is received by the set of rotator assemblies (5a-5d) within the fabrication operational range, characterized in that the fabrication assembly further comprises a first set of trolleys (6a-6d) movable along the first track at least within a workpiece transfer range along the X-direction that at least partly overlaps with the fabrication operational range, the first set of trolleys (6a-6d) being configured to receive the elongate metal workpiece thereon with the workpiece main axis substantially parallel to the X-direction, wherein the fabrication assembly is configured to transfer the elongate metal workpiece between the first set of trolleys (6a-6d) and the set of rotator assemblies (5a-5d) within the workpiece transfer range substantially in a Y-direction being a horizontal direction transverse to the X-direction. wherein the at least one first fabrication robot (4a, 4b) is configured to perform metal fabrication action on the elongate metal workpiece within the fabrication operational range when the at least one first fabrication robot (4a, 4b) is within the fabrication operational range while the elongate metal workpiece is received by the set of rotator assemblies (5a-5d) within the fabrication operational range, characterized in that the fabrication assembly further comprises a first set of trolleys (6a-6d) movable along the first track at least within a workpiece transfer range along the X-direction that at least partly overlaps with the fabrication operational range, the first set of trolleys (6a-6d) being configured to receive the elongate metal workpiece thereon with the workpiece main axis substantially parallel to the X-direction, wherein the fabrication assembly is configured to transfer the elongate metal workpiece between the first set of trolleys (6a-6d) and the set of rotator assemblies (5a-5d) within the workpiece transfer range substantially in a Y-direction being a horizontal direction transverse to the X-direction.