Here I would like to point out some real missions of special commandos like the SAS and others in WW2 that could inspire new HD2 co-op missions. Assault on Brecourt Manor on D-Day, Easy Company, as depicted in Band of Brothers. Central part of the mission would be wide system of trenches of about 300 meters length with four artillery cannons, located in a field surrounded by hedgerows. Your mission there is to destroy the cannons. We have no plan how the trench system really looked like, it might have been like the maker of the first video shows it.
The terrain could be made with the new tools mentioned by Snowman. For other parts of the map like the trenches we could use parts of H&D2 maps like Ardens2 or Africa5. I’m not so experienced in creating whole new mission maps, so please share your ideas how to make a new co-op mod based on this real mission.