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The thing is that lend-lease was signed in October 1941. The Germans basically lost the Battle of Moscow by the mid of November and by the start of December the Russians started their counter attack. They did get some British tanks and airplanes for this battle, but these were not lend-leased but traded with Soviet gold.
So basically, while the Soviets certainly got a lot of supplies from the Allies, the Germans were already on a run by then. It certainly helped speeding up the end of the war, but the Russians highly likely have run over the Germans (and rest of mainland Europe as well) anyways.
Luckily the US managed to get as far as they did, otherwise the world might have been looking totally different today.
EDIT: I love your pictures btw… I want that LEGO set for sure. 😛