Ok, I've been thinking about this one a while, and it's pretty simple:
A plain map with two trenches on either side, the trenches can be decorated with the wonderful IE props and little places for machinegunmen and snipers to go into. In the middle will obviously be no man's land, scattered with debris and shell holes to hide in during charges.
Some rules would be snipers are aloud to snipe anyone apart from artillery and in some circumstances, the machinegunmen. There will be charges every 5, 10 or 15 minutes where all the men charge and are aloud to hide in the debris/shell holes in the middle of the battlefield. Obviously charging will be hard, so it should be regulated.
Here's a quick little thing I did on paint for it:
Hopefully this can be a new map for 2.0..