Sorry guys, been a bit of a crazy weekend and haven't had a real chance to check in till now.
Bsyamato: Fantastic job there on the Ki-61, just posted you. And the Zuiun looks great too!
PJ: Great job there, the basic cockpit looks great!
I'm not going to comment much on the whole primer thing since I'm not sure about the issue. The article Steve linked is great, very useful. A guy did post these two photos on the FaceBook group I belong to that might be of some use.
I noticed that the Raiden being an army fighter has paint all beat to hell while the Zero's paint looks almost pristine here. As you pointed out I think the IJN gave it's planes a lot more TLC than the IJA.