Pictures (walkaround) in museum are very usefull for details, but not for colours (of course !). You can find a lot of photos of Flying Tigers in 1941 and some of these are in colours. You can see (and imagine) the poor conditions of these P40 in such "spartiat" aerodrome, with dust etc...Then, all these informations are really usefull for you model's weathering. Have a nice profiling with your P40. We are waiting for it !!