There was a restored Le Mans at last year’s national event that was for sale for (if I recall correctly) £20K. The car as presented looked like a new car to me, which shows just what can be done. The details of the company that did the restoration are visible in the picture attached - you could ask them about the likely costs involved (or any of the many other companies offering a similar service). I’ve no affiliation with the company or car other than a short chat with the owner of the car at the event (I recall he was associated with the restoration business).
