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Your challenge is to come up with a plausible POD to turn a Sherman tank into a Sturmgeschütz type vehicle. Perhaps WWII has dragged on longer or Israel never aquired Centurions (Sorry MacCaulay) and is forced to improvise. Is such a thing plausible? Discuss.
Note: I personally am picturing a cross between a Sherman Kangaroo and the Swedish S tank, but any ideas and artwork is welcome.