Ok this is my overall idea of a good story to go along with an Alien Invasion theme.
I would split this mod/story into 3 epochs.
The first Epoch would be the very first encounters people on earth have with the aleins. This would be murder scenes that local law enforcement responds to, SWAT teams, or in the middle east even local Militias could be included in the mod. These maps would be dark, eerie, horror based, the aleins would be lightly armed with melee and some ranged weapons for stealthy kills. The human forces would have normal weaponry as we have today that you would expect.
This would be a great place to start for the mod because lots of the weapons are easy to recreate like simple pistols and rifles. Then maps could be made on familiar places which will not require many new statics to be made. This reduced workload on us and makes release easier.
I am thinking the first release could include 3 maps. 2 of which are set in this era. One set on a farm at night where local police have arrived with shotguns, and pistols to investigate a 911 call that went dead after some strange noises. The aliens would rely on stealth and hiding to kill the police and win. The police would have to hunt down the aliens or whatever... objectives could be added but that's for later.
The second map would be set somewhere completely different, like you know, the middle east, in a setting sort of like de_dust but in a much more wide open village with small homes/huts spaced apart from each other with lights illuminating certain areas. This would be a Middle Eastern Militia team vs an alien team.
Having these 2 maps would show that the aliens show no mercy to any humans no matter how different they are, setting up the stage for Epoch 2 where the wold allies itself against an ever greater threat from space.
Now, the second Epoch. This is where the hardest battles are fought, cities are being ravaged and destroyed, leveled completely to the ground by the main invasion force of the alien threat, they come in massive mother ships which can feed an assault for months on end, literally draining earth of its man power by keeping an up a worldwide onslaught over the world population. The aliens technology is vastly superior to our own but we still fight, and win some battles against the massively overpowering foe. The earth's military is at its climax during this Epoch and it sets the stage for the final stand of mankind on earth, after the world has been desecrated by our superior enemies.
The third and last Epoch is after the dust has cleared and the world is in ruin. Aliens have began constructing structures on the surface for a few years now, and remain hunting down the last pockets of human survivors who have been scavenging for survival the last few years after the main military's defeat in North America almost 5 years ago. This new generation of humans have learned how to evade the aliens well though, they have also fabricated some of their own alien/human weaponry for defending themselves agianst alien death squads and search parties.
This is where I think the 3rd map of a first release should take place, a small settlement of humans is discovered by a light alien force and the humans have to fight for their lives or face the doom the aliens bring. Soemthing like that..
Anyways, I think it would be really great... And it would be easier to start out small that try to bite off too much all at once...
What do you guys think?