I would like to give my 2 cents about a specific sound thing: the structural creak that you hear almost every time is a bit overdone. What you guys don't seem to get is that the noise of the engine in front of you is the most potent, deafening thing that you have in the cockpit, you would probably be able to hear the thud thud thud of the guns, but the engine is SO loud you guys have no idea. To hear the structural creak like that you need:
1) to be pulling crazy Gs, almost close to the breaking point (the max G I pulled in a real P-51 mustang was 6.2 and never heard a thing). The sound u use sounds more like a submarine structural sound, if anything it should be a shorter creak sound.
2) probably to be with the engine on idle! Again, the sound of the engine is deafening, it covers everything else.