Hmm, the new Soviet medium is researchable from the T-54.. I wonder how fast I could reach it from the T-43.
I've also been playing with the ARL V39. That thing is bloody horrible. The gun is great (212mm pen), but the machine itself has no armour, a massive weakspot on the top, and it isn't very fast. This hasn't been fun at all, feels like a massive grind.