First of all I don't know if this has been discused, but I couldn't find it searching the forum, so here I go.
I think the 3d mesh of the Mustang B (the one used by the RAF at the game in the sicilian campaign) in the game is not completely acurrate. I don't know if this is 100% correct, but I always thought that no Merlin powered mustang had that small scoop at the engine hood. As far as I know, that little air intake was for the Allison carburetor used in the P-51A (The Allison powered Tomahawks have this scoop as well), so a P-51B shouldn't have this at the top of the nose, am I wrong?
Besides, I realised that the plane's guns are quite long, so long that the gun barrels extend beyond the leading edge. The P-51D had six 0.50 (12.7mm) machine guns and had no problems with the gun lenght (100% located inside the wing). All the pics I've found of P-51B had the guns instaled like the P-51D, but I found pictures of Mustangs with gun barrels exceding the wing, although these were pictures of P-51A (Mustang Ia for the RAF, the first Mustangs received by the brittons), which were equiped with 20mm cannons instead.
Notice the scoop and the cannons in this early Allison powered Mustang (oddly enough, with USAAC markings)
I know it's nothing serious, but I want to confirm if some P-51 with these features existed or it's reasonable to think that there has been some confusion between Mustangs.