Honestly I don't see what you mean by "a Clean Build" it's weathered and dirtied up. I believe Karl's focus of the diorama is the Stug, and the action surrounding it, with the tank commander talking to the soldier on the side of the road. I would think that adding a kubelwagen would detract from Karls plan for the dio, besides it not fitting.
Vlad, Use the Search function and you would have found the earlier post on this.
Karl, I like it! It's very life like, and has that I just conquered France feel to it