The rear of the car is made in a massive jig which I would have thought should also have ensured a high degree of consistency. An article published in "Welding and Metal Fabrication, June 1968" shows the jigs and describes the methods. These pictures are from the article.
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The second picture shows the jig where the front end, rear end and roof are added, in that order, each having been constructed as sub-assemblies. The article describes its use thus: Hinged frames are used to locate the apertures. The door apertures and rear quarter light apertures are located by such frames. Similar frames are used for the rear window and boot apertures. In each instance, the hinged frame is locked against positive stops and acts as a checking fixture for ensuring alignment and position of the panels. When the welding is completed in this jig little else is left to complete the body assembly and the loading trolley is taken out and rolled onto the transfer trolley and a number of final welds are made to complete the attachment of sills, outer wheel arches and windscreen flanges.
This is shown in the third picture before it is passed to the body finishers for the final operations including lead loading, bonnet fitting, door hanging and so on.
The article concludes with the words "In a car of this class these items are of considerable importance and much of the care taken in the welding work is repaid by the minimum work necessary at this stage".
