I read about this in a Kit Car Mag back in 1995
A company called Strohm was building Replicas of the Coutach 5000QV, they were call the Strohm De Rella V6 Turbo built in German. A mould was taken from a Real 5000QV and then had some minor details added and a special rear wing that wasn't anything like a Lambo offered at the time.
They call it the De Rella V6 because it used a Renault Alpine A610 V6.
Strohm built these cars on customer demand, the future owner could specify just about anything on his replica.
Strohm replica's are considered to be among the best Countach replica's available, these cars were never available as kit cars, you could only order the complete car in the early 1990's.
You ordered your car and it would be built by Strohm for a price around US $60,000 ($60,000 US in the 1990's is how much today is anyone guess)
Lamborghini know about this and never worried about it.