Rotor till the whole yard and start over, seed or sod. Or you could try one of those aerator deals where it pulls little plugs out of the yard, and leaves little holes. Not really sure, just guessing. Good luck.
Don't know if you'd call it a project but the wife and I have gotten probably 500lbs of metal out of the rivers near us. I'm keeping the wagon wheel. The pile in my truck was just the first trip to scrap.
I didn't see the guns.....I only watched the video once, though.