My goal was to build an historically accurate 'replica'. But, as is typical with vintage vehicles, only a few drawings are available. Fortunately, a variety of other sources exist which, with the drawings, made it possible to reconstruct the key dimensions and begin to produce a set of CAD drawings.
But why CAD drawings? For a start, it is the surest way of getting dimensional consistency. The more important reason is the emergence of 3D printers. Although they promise to simplify the creation of many of the parts, they need CAD-created files as input. So, I took a deep breath, bought the software, and jumped in.