The trouble with these cars was not the core engine and body, it was all the parts that were unique to the model that are prohibitively expensive or NLA. I remember talking to a now ex member of the MBCNSW who owns one at a german car day. He had just spent $850 on a part that would cost $50 on a W126, because there was no aftermarket and mercedes was the only option. I don't recall the part, but it was quite essential to the car.
he had many stories like this.