Red shows where I mucked up with cutting the gun mount ..
You could sculpt a canvas mantlet cover out of epoxy putty or tissue and glue. Hides almost anything. Ask me how I know...
And, while I like the idea of a 35mm Gatling in almost anything, isn't is rather overkill for zombies? If kill rate was desired then multiple .50 cal Gatlings would work better, no? You could carry more ammo, too.
Remember, 35mm rounds are the size of a quart milk bottle. You can't fit many of them inside a Panther hull.
Still, that has nothing to do with the model, which is coming together swimmingly!
Paul