Hi,
The conveyor was a big feature!
Remember being told around 20 years ago that when BMW took over Rover they tried to put a 3 series bodyshell along the conveyor. It didn't fit.
A week or so ago I read that Austin had the same problem with the 1800 (Landcrab) and that the unpainted shells were taken between the 2 parts of the factory by lorry, whatever the weather.
Ian