I liked a lot your proposal, the only thing doesnt convice me is having the Elephant and the Tiger in the same Army Group
I think that's the only
REAL way how to put them in.
Remember, the doctrin is focused on
heavy tank combat, the first unlock on left side additionally prevents the player to build
any Paks or even artillery.
So I would say it's fairly balanced, seeing how two IS-2 can ripp a King-Tiger and the soviets may have also the ISU-152 in the backhand, the Red Army should have no problems with winning against this special doctrin.
US-player can blobb the Ostheer into hell, remember: No HMG and no arty!
Brit may have a few issues, however, it's nothing a few Fireflies can't solve.