The most amusing diorama I saw produced by a "serious builder", was an early model Panzer IV (short 75mm gun) transporting SS troops in 44-dot camo smocks and armed with MP-44 assault rifles. Supposedly, the scene depicted the invasion of France in May 1940. I could see the camo, because the SS was the first organization to widely issue camo gear to their combat troops. But figures were wearing gaiters and low quarter shoes and the MP 44/Sturmgehwer were apparently used because they "looked cool". That's not counting bolt holes in the Panther D vs the Panther A, that's just science fiction.