On a random Google search, rediscovered this game which raised me more than my parents did. I'm trying to remember the name of this custom map that I spent a majority of my time on. It was something like Base Wars.
It was a different but interesting concept compared to the vanilla maps. Each team starts on either end of this long narrow map. There are construction jobs to build up your bases defenses. You can add walls, towers, gun emplacements, medic and ammo shacks, etc. I think there were even tunnels running through the no man's land. The goal would be to either build up your base or destroy the elements of your enemies base.
Surely someone here remembers this map?