Hello,
I am curious who the source for the "Desert Rat" extrusions are (for that matter Don Brooks B-17 project as well). Also how are the vintage Alcoa die numbers / Boeing die numbers being crossed referenced to modern Alcoa catalog. I have copies of vintage (Alcoa) and modern extrusion books (Tierney) and trying to find as match seems impossible at times for my replica P-35 project ! Contact me through this board, or david@P-35.com