Strictly considered, it was more of a semi-monocoque, as it used a box-section, pressed-steel frame with twin side rails riveted together via crossmembers, along with floor pans and rear and front bulkheads.<ref
In its strictest sense, this structure was semi-monocoque, featuring a box-section, pressed-steel frame with two side rails secured by crossmembers, along with floor pans and rear and front bulkheads.