There were older Citroen cars with a lot of plastic/composite parts. For example, the Mehari used a lot of plastic parts (ABS) and is from the late 60ies. It

There were older Citroen cars with a lot of plastic/composite parts. For example, the Mehari used a lot of plastic parts (ABS) and is from the late 60ies. It didn't prevent rust completely however. For example, the Mehari was as prone as the 2CV to have a chassis breakup. My father actually got one with a broken chassis (in fairness, more due to the fact it has been driven in very rough roads around South Europe and Asia Minor in the 70ies) and spent a summer disassembling it completly to replace the chassis (he still has a beautiful photo with all the parts laying around). One thing to keep in mind is that the Mehari, as the 2CV, was designed to be a very simple and cheap car from the 60ies (the 2CV design even traces back to the 30ies). This actually somewhat wonderful as it's possible for a single person to service these cars alone with a few basic tools if he knows a thing or two.