Hi thank you for a very informative forum. I have just found this today & it has a ton of good info. I am an aircraft engineer based out of South Africa with the privilege of assisting/starting with the rebuild of the South African Air Forces only remaining Spitfire Mk9 Low back. Things are slow as its hard to find the right drawings (even though i have purchased some 3-4000 drawings) & tooling at an "affordable" cost. But your historic info here is stunning! Thank you!