Devin Olsen and Gil27 have put up a movie and some screenshots of multiplayer action on the engine room portion of The Maw. You may remember that a poll at Halo Mods asked what level, after the Library, should be converted into a multiplayer level, and this was one of the choices.

The map isn't available for download yet, but it might be... sometime...

The screenshot post by Gil27 and Devin Olsen gives special thanks to MonoxideC (creator of the Library multiplayer conversion), ViperNeo, ZexGX, and Zelda Freak. Thanks for the note to Louis Wu at HBO.