Things you descibe do usually happen in mass production. Small stuff is usually being totally confused by workers not aware of what's the difference between Pitot tube or gun barrels. A mon avis your model looks nice, however as if it has just left the Nakajima plant. I can't imagine a warplane being so clean. I have also heard that paints used by Japanese manufacturers during WWII were of poor quality and couldn't stay undameged and unwheathered for a long time. So I see this nicely molded model beautiful but unrealistic. In your shoes I would have it repainted completely with preshading, filtering etc.
Yes, I haven't been around for a while. I was in Yemen, where Yemennet (local provider) considers this site not good for real muslims (suspected in porn activities, as I was informed). Poor idiots!