Unfortunately, I believe the old map, aka "Legacy" will only be for viewing and not for building; but don't quote me on that. I think it was mentioned up to a couple threads back by someone who's kept more in the loop of things.
I'm sorry but the ignorance of some PC diehards is astounding!
@Surround: Please learn the difference between "Auto-aim" and "aim assist".
@TFchris: What is different about playing first person shooters on a console than on gaming rig?...