p-61b black widow last variant of the p-61 to see combat in ww2 p-61c came too late to see combat.
Lady in the Dark here is the last plane to be credited with a kill in ww2 Even though it didn’t fire a shot.)Enemy plane crashed due to pilot error from trying to evade the p-61b. (this is a unofficial credit since the event occurred a day after Japan surrendered)
f4u-5 or 5n. though came too late to see combat in WW2 (f4u-5 started production in 1945 and 5n in 46) it did see action over Korea. with the 5n being a successful night fighter. the 5n could be a potential 6.0 br TT version of the au-1 being that the au-1 is a modified f4u-5 for CAS.
Petropavlovsk (Ex Lützow) Admiral Hipper class
This ship was unfinished when sent to the USSR, if added it could be given the basic Hipper design or if blue prints exist of the original new Soviet design