One thing I read in a link someplace from this BBS, I'll have to try and find it again, is that the designers of the P38 stated that most of the hits absorbed when a fighter is shot at are along the fuselage axis where the P38 has mostly empty space, right between the twin tail booms. They stated it as a percentage factor, and I can't remember it for the life of me, but it was astonishingly high, the amount of "air" that incoming bullets would hit instead of aircraft body.
I've even noticed this in AH, when talking about getting skinny, IE pointing your wing at an opponent who is firing or just about to get into a firing solution whenever it is possible. Even when you can't get that wing quite at your opponent, even though the P38 seems like a large target, and planform with the big wing, it is, there is still that spot, the "sweet" spot the designers were talking about where most incoming rounds hit standard shape planes, that the P38 has nothing but empty space. When shooting at P38s many times in deflection shots with the 30mm, I've had rounds whistle right through that spot on playback on flim, shots against any other aircraft would be catastrophic kills. It's one of the fascinating things about the P38 that makes it sort of a romantic aircraft to me, the fact that it is big, yet small at the same time.
I hope somebody here, one of the P38 guru's, or probably WideWing, knows that source for what I'm talking about, I'd love to have a permanent link or copy of that information, regarding that empty space in the design, and how incoming rounds were factored into that etc.