Of course one can already buy replicas that might be as close or closer to the original than may ultimately be made if this project comes to fruition. Go to:
https://www.jaguarreplicas.com/
For the last four or five years I have entered my Elva MK IV sports racer at the Lime Rock Historic Festival. Entries are limited to "real"--not continuation or replica--cars and I have raced with C and D types several times. No doubt because of their value they rarely see the track and whether because of their owners' abundance of caution or lack of seat time they are driven quite slowly. It is somewhat dismaying that a D-type should be a back-marker, but so it goes.