Don't get me wrong, I love the idea of the Me321/323, and it'\d be cool to see.
But what kind of role can we give it?
It seems to be more the predecessor of a strategic airlifter than a tactical one. I mean, are you gonna be landing those marders on the front line? It's a slow, big target that would be fun in theory, but without a highly elaborate supply system in a "total war" environment, it would see very little use. Besides, it's huge. Can you imagine how many artist-hours it would take to model each of the gun positions?
(BTW, there were experimental "Waffenträger" and bomber versions of it. IIRC, the gunship wasn't popular because, although it carried A LOT of guns, it was a HUGE target that was easy to whack. And the bomber testbed had been strafed by marauding yankee planes, so when it took off with a single 17,000 kg bomb, it suffered massive structural failure.
)