I'm a little late to the thread. However - I've built a 'Smear the Quear' map. It was one of my favourites from Halo:3, and my friend and I honestly couldn't pass up the oppurtunity. We've tested it out - it works great. Can't wait for it to be downloaded and the like, have all our friends playing on it at once. The only thing that upsets me is that the 'Quear' can no longer be a pink spartan. Just a really scary, odd lookin' flood. But the intent of the gamemode is still there, and that's all that matters. I've also built, alongside the same friend, several neat little maps on Impact. Can add my GT and check 'em out sometime, if you'd like.