The KI84a, despite the heavy investment in terms of factories, hasn't see yet a fully repaired factory. However we're close and so we'll soon start to advance it. You would notice the heavy investment both on the KI-84a and KI-84b. The idea is to get the KI-84a by july 1943, the KI-84r and the KI-84b by the first half of 1944.
That's very early!! It would be great to have it then. Just getting them now in 11/43 in mine.
I'd say your R n D looks great for a first game, but also very good for any game based on your stated intent. You will be getting most of the important 44 models in mid-to-late 43. That should keep you in a more balanced air war.
Looks like for NF you're going with whatever comes along and taking them as they arrive. One thing I did not do which I should have done is to keep some Ha-31 engines for the Ki-45 KAId NF version that uses them. I won't be making any of those. I did invest in the Ki-102c Randy (started late after realizing it's not on a line with the other Ki-102 models), and the very late S1A1 Denko. As it looks like my game might still be going then I hope these can do something against 4Es, but I don't have much hope for them really being effective. Still I want to try them out.



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