A method of producing at least part of a structural frame of a vehicle, the method comprising: providing a support structure, the support structure comprising: a plurality of elongate members; and one or more retaining members configured to retain the elongate members; and (s10) mounting a plurality of first structural components to the support structure by coupling the first structural components to the elongate members such that each first structural component occupies a different respective position along the elongate members, wherein each of the first structural components comprises a plurality of through holes; and the method further comprises: for each first structural component, coupling that first structural components to the elongate members comprises positioning each elongate member through a respective through hole of that first structural component; and wherein coupling the first structural components to the elongate members such that each first structural component occupies a different respective position along the elongate members comprises sliding the first structural components along the elongate members; and attaching a plurality of second structural components to the first structural components, thereby coupling together the first structural components to form the at least part of the structural frame of a vehicle. providing a support structure, the support structure comprising: a plurality of elongate members; and one or more retaining members configured to retain the elongate members; and a plurality of elongate members; and one or more retaining members configured to retain the elongate members; and (s10) mounting a plurality of first structural components to the support structure by coupling the first structural components to the elongate members such that each first structural component occupies a different respective position along the elongate members, wherein each of the first structural components comprises a plurality of through holes; and the method further comprises: for each first structural component, coupling that first structural components to the elongate members comprises positioning each elongate member through a respective through hole of that first structural component; and wherein coupling the first structural components to the elongate members such that each first structural component occupies a different respective position along the elongate members comprises sliding the first structural components along the elongate members; and attaching a plurality of second structural components to the first structural components, thereby coupling together the first structural components to form the at least part of the structural frame of a vehicle. for each first structural component, coupling that first structural components to the elongate members comprises positioning each elongate member through a respective through hole of that first structural component; and wherein coupling the first structural components to the elongate members such that each first structural component occupies a different respective position along the elongate members comprises sliding the first structural components along the elongate members; and attaching a plurality of second structural components to the first structural components, thereby coupling together the first structural components to form the at least part of the structural frame of a vehicle. <EOS>