Interesting possibility but the Germans actually built something much like this: it was called a Jagdpanther. The gun and wheels seem to be carry-overs; the box at the base of the gun's saukopf would make a nasty shot-trap so I'd redesign that one. The rest appears ballistically well-formed. I'm guessing that the angle iron on the left glacis is for bullet-splash but seems rather few to do the job effectively. Was this one pure speculation on their part or are their vague napkin drawings from WW2 that actually played with this idea, and why if it seems to be an albeit lower-profile Jagdpanther?

I agree with Frank.