I had my graphics guy redraw him from a photo of the tail of an A-12. There were quite a few different versions of Skunkworks logos out there so I went for the obvious choice! The two graphics on the sides of the upper are redrawn from the logos for Roadrunners Internationale, pilots of the A-12s, who gave me permission to use them. I actually put concept of 'Oxcart Racing' when I got an opportunity to meet them at a reunion a few years back. Figured air speed and altitude record holders might like the idea.