Richard so far through several references, mostly of IJA aircraft, I havent noted standout details on the fuel drums, which are frequently seen. I did notice the barrels with 3 stripes painted round the center section were frequently seen but only in what appear to be IJN settings. I did see several barrels with variations of corrugations around the top and bottom thirds of the drums. I saw these in both IJA and IJN settings.
So not much to work with but I do like the artistic license youve applied thus far. That and some liberal application of dents and weathering should create plenty of interest.