Here's some more idea's that either don't require changes to 3d models or the new models have already been made...
Bf-109G4
(Model made by HunInTheSun. Armament of G2 with flight model of G2 or G6Late)
Bf109G10 with 20mm Motorkanone
(Bf109G10 but with 30mm Mk108 hub gun changed to 20mm MG151/20 (200rpg). Original Bf109G10 renamed to correct Bf109G10/U4)
Bf109G14 with 20mm Motorkanone
(Bf109G14 but with 30mm Mk108 hub gun changed to 20mm MG151/20 (200rpg). Original Bf109G14 renamed to correct Bf109G14/U4)
Ki-61-I-KAIc
(Ki-61 Ib but with armament of Ki-100 (2x 20 mm Ho-5 cannon in nose (120 rpg) and
2x 12.7 mm (0.50 in) Ho-103 machine guns in wings (200 rpg))
A6M3 Model 22
(Unsure who made this model, A6M3 Model 32 with original wings featuring extra internal fuel tanks)
viewtopic.php?t=3558&highlight=a6m3
F6F-5 20mm Field Mod
(Some F6F-5's (including all the F6F-5N and F6F-5P) had the inner .5 MG replaced my a 20mm Hispano with 200rpg.
1942 Spitfire F.Mk.IXc
(Model made by Ranwers. Early model spit9 with Merlin61)
1944 Ki-84 Hayate
(Ki-84-Ia model but with reduced power (1825 hp Nakajima Homare Ha-45 Model 11 instead of 1945 versions 2000hp Ha-45 Model 21 as in game))
And one last one that might need a little work.
Fw190D-13,
(Fw190D-9 model with Ta152H nose and tail. Flight model of D9, armament (1x30 & 2x20) of H)