A method for manufacturing a unitary body side structural frame of a vehicle comprising: providing a plurality of blanks (10, 20); joining the blanks to each other to form a composite blank, wherein joining the blanks includes forming one or more overlapping regions (11; 12; 13; 14; 16; 17) formed by partially overlapping two blanks; deforming the composite blank to form the unitary body side structural frame; wherein the unitary body side structural frame includes a lower beam portion and an upper beam portion, a front pillar portion connecting the lower beam portion to the upper beam portion, and a rear pillar portion connecting the lower beam portion to the upper beam portion, wherein the unitary body side structural frame comprises a B-pillar portion, and the lower beam portion comprises a rocker portion; and wherein either the unitary body side structural frame is a front frame, and the upper beam portion comprises an A-pillar portion, the front pillar portion comprises a hinge pillar portion and the rear pillar portion comprises the B-pillar portion and wherein at least one of the overlapping regions substantially corresponds to a transition between the B-pillar portion and the A-pillar portion and is arranged within the A-pillar portion; or the unitary body side structural frame is a rear frame, and the front pillar portion comprises the B-pillar portion and the upper beam portion and rear pillar portion comprises a C-pillar portion extending from the rocker portion to the B-pillar portion and wherein at least one of the overlapping regions substantially corresponds to a transition between the B-pillar portion and the C-pillar portion and is arranged within the C-pillar portion; or the front pillar portion comprises a hinge pillar portion and the rear pillar portion comprises the C-pillar portion, and the upper beam portion comprises an A-pillar portion and the A-pillar portion extends from the hinge pillar portion to the C-pillar portion and the C-pillar portion extends from the rocker portion to the A-pillar portion and wherein at least one of the overlapping regions substantially corresponds to a transition between the B-pillar portion and the A-pillar portion and is arranged within the A-pillar portion. providing a plurality of blanks (10, 20); joining the blanks to each other to form a composite blank, wherein joining the blanks includes forming one or more overlapping regions (11; 12; 13; 14; 16; 17) formed by partially overlapping two blanks; deforming the composite blank to form the unitary body side structural frame; wherein the unitary body side structural frame includes a lower beam portion and an upper beam portion, a front pillar portion connecting the lower beam portion to the upper beam portion, and a rear pillar portion connecting the lower beam portion to the upper beam portion, wherein the unitary body side structural frame comprises a B-pillar portion, and the lower beam portion comprises a rocker portion; and wherein either the unitary body side structural frame is a front frame, and the upper beam portion comprises an A-pillar portion, the front pillar portion comprises a hinge pillar portion and the rear pillar portion comprises the B-pillar portion and wherein at least one of the overlapping regions substantially corresponds to a transition between the B-pillar portion and the A-pillar portion and is arranged within the A-pillar portion; or the unitary body side structural frame is a rear frame, and the front pillar portion comprises the B-pillar portion and the upper beam portion and rear pillar portion comprises a C-pillar portion extending from the rocker portion to the B-pillar portion and wherein at least one of the overlapping regions substantially corresponds to a transition between the B-pillar portion and the C-pillar portion and is arranged within the C-pillar portion; or the front pillar portion comprises a hinge pillar portion and the rear pillar portion comprises the C-pillar portion, and the upper beam portion comprises an A-pillar portion and the A-pillar portion extends from the hinge pillar portion to the C-pillar portion and the C-pillar portion extends from the rocker portion to the A-pillar portion and wherein at least one of the overlapping regions substantially corresponds to a transition between the B-pillar portion and the A-pillar portion and is arranged within the A-pillar portion.