When I started building the stash, I had to research many different aspects of the IJA and IJN air forces. One of the most difficult was the color schemes. The navy was easy after 1942 because they had that deep dark green that's almost on everything they used. The army, on the other hand, has more variety in their colors used. Then you have those tail IDs, here the IJA tends to use fancy designs for their aircraft. The IJN was constantly changing their IDs, which can get confusing and make it difficult to build specific aircraft.