Marv,
I own a replica of an XK120,OTC. I have had it for over four years and it still is not even started to be assembled. I'm doing a lot of research on how to make it appear authentic as possible. I own several guides to authenticity and other reference materials. I have also been collecting parts from original XKs to use on it. One thing you will find, is that many differences appear in restorations, based on who is asked about what is correct. Even the fact that the replica is fiberglass does not preclude it from being an authentic recreation. It turns out that back in the early years, there was one that raced regularly in southern California. Hopefully, if you have any questions I can help with what is correct and what is not. I might even be able to scan photos of material I have. I also own several historical books about the development of the XK series of cars.