This cutaway rendering was originally published in the December, 1944 issue of Industrial Aviation magazine, as part of their "Design Analysis" article on the B-17. The same drawing was printed in an issue of Flying.
The original artwork was drawn by R G Smith and J W Tillotson.
The wallpaper version presented has had the included text removed and the background color changed to a light blue.

4:3 screen:

Widescreen: