Wild shot in the dark but i've been looking for a custom CW2 map for a while now but can't find it as i don't remember the name.
The one standout thing about it was that there was a max density creeper block encased in digable terrain at the end of the map.
You basically had to build/upgrade till you were ready then fight it off with mortars/blasters and shields.
It wasn't the one called "Nuke Bomb" but was similar in goal.
There were no Experimental weapons on the map either.
Posting the answer from discord here for parity. It was map #5: Choice 2 (http://knucklecracker.com/forums/index.php?topic=7687.0).