One thing I have wondered about is just how interchangable the different tanks were. For example, the P-47 had that "flat" 108 gal belly tank that I do not think that was used on any other aircraft. Of course its design was to accommodate that low hanging belly of the P-47.
Also no mention of the 165 gal steel drop tanks Lockheed was building. That Av Week article is dated June 1943, so presumably they were in full production before then. Perhaps they were reserved for the Pacific?
The early drop tanks used on Hurricanes had built-in pumps to get the fuel out. I wonder just when the approach of using the exhaust from the the vacuum pump was adopted? Since we had drop tanks long before the RAF I assume it was a US invention.
I have often thought that I'd like to write a book on The Other Stuff:
1. Drop Tanks
2. Radios
3. Oxygen Systems
4. G-Suit Systems
5. Environmental Control Systems
6. Automated Controls
The collective impact of all that Other Stuff was enormous.