Bob, I can't argue with you doing YOUR diorama the way you see it--that's your artistic choice and right, just as it is for you to not use punctuation and capitals in your posts, (grrrr!). ;)
I'll just say that if I wanted to capture a large-scale attack in the Ardennes battle area, I would probably have focused on a company of say, King Tigers over-running a town in which a company of Shermans were getting the stuffing shot out of them. I'd have several KT's and several shot-up Shermans, and a definite, direct line of attack from one side of the did to the other.
Or, maybe better yet, I would have done it in 1/72 scale in order to be able to separate the elements a bit more and to give more of a sense of the breadth and depth to the scale of the attack and the overall scene?
Personally, I wouldn't have thrown in so many diverse vehicles and scenes within the whole. Maybe a German sdkfz half track with grenadiers supporting the Tigers, and perhaps a jeep on the American side too, but that would be about it. While it's true that many different vehicles and guns took part in the German attack, they would not likely have been so interspersed. Germans had a pretty strict order of battle, and every element had its place and mission to do, and to mass them all together like that isn't something you would normally see except in a situation like the Falaise Gap massacre, where they all had to flee through a small breach.
I'm not trying to discourage you, just pointing out the great difficulties in trying to comprise a huge diorama like this. In the end though, it doesn't matter if you are happy with it and it's completion brings you joy. That is, after all, what this hobby is really all about. :)