RE: TF GS P47 Build - yeah another bloody one!!
doug, I understand your concern and I would advise doing any thing that gives you sufficient confidence in your system. After all it may be cheap insurance!
Peter, You are correct that if you documented the Duxford plane and then copied it for competition you would be fine. What that example points out is (to me any way) is that Museums are not infallible as many people assume.