I am currently making a multiplayer map pack that will contain 5-7 maps (haven't decided how many yet lol =P). Here is the first one I've made. This is a beta test of it so there may be some bugs that will be fixed in the full version multiplayer map pack or through patches (whatever you decide). I have attached a picture of the map and a second one will be up soon.
Please report any bugs or things that require my attention (non respawning guns or no guns in certain areas that need them). This first map is called Refinery I hope you like it (beta version for now).
Link to file download:
http://www.megaupload.com/?d=E6VO4VRX