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Captain Eugene has built a minifig scale M3 Stuart light tank, and has used the chassis to build a Howitzer Motor Carriage M8. As a bonus, he has also build a larger version of the latter as well. Though all three vehicles are exceptionally well done, I find the two minfig scale ones particularly impressive as I know just how difficult it can be to build in that scale and still manage to integrate working features. (Via the Brothers Brick.)