IMO, an accurate replica is a "fool's errand."
Only SAAC (Shelby American Automobile Club) judges would be able to tell the difference between accuracies and inaccuracies and yourself. And SAAC judges won't care.
I went to smallish car show recently and just about no one knew my car was replica and the rest thought I had a chrome 3M vinyl wrap on my Kirkham.
But if it's fun for ya, go for it.