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Russian naval ships of WWII I would buy a kit of;
Modernized Gangut class (Oktyabrskaya Revolyutsiya, Marat, Parizhskaya Kommuna)
Sovetsky Soyuz (yes it was never completed, but)
Leningrad class DD
Tashkent
Maybe an Ognevoy (Proj 30/K)
Kirov (Proj 26)
Proj 68 if you still consider that WWII era
If you want to tap a niche market, I don't know how many people here would actually be interested in buying models of ships with no real historical significance but WoWS modeled quite a few Soviet paper ships and I think they'd definitely make cool models if a company was able to collaborate (or just steal) their 3D models and turn them into real plamo.