i am going to make a mod soon, when ive sorted out my xbox and stuff and so i quickly drew up some of the plans for what it will do:

as you can see, my drawing skills arent brill, but this is a rough sketch as nothing is yet final.
features of the map:
there will be a train of death (from terminal) on there, the train will be activated by the pressing of the button near the tracks. the shield area is a little 'revenge' area where if someone you see goes into the area and you hit said train button, a shield pops up encasing them so they cannot escape... and then yes, the train comes and revenge is done.
There is also a highway that passes around the map and tunnels through the area under the large base. it also connects up to the top of the tower on relic, where there will be about 4 warthogs or so waiting to get driven. there will also be an elevator on the side of the relic tower to get up easily
the banshee bay is out at sea about 10-15 metres from land, like an oil rig. there will be either 1 or 2 banshees there... maybe a pelican
please tell me what you think and what i could do to improve this or any tips or tricks. i am going to be a newbie modder but i have had some experience in languages and most of the stuff here can either be copied from other sources on the game or (like the highway and remodel of some of the map) done myself using 3D programs which i am experienced in
cheers.. sorry again if it is in the wrong place