When i got Halo CE, the first thing i thought of was re-vamping the halo campaign to make it a mass-scale operation. by that, i mean 30-40 marines at your back to hundreds of covenant. my largest re-vamp was silent cartographer, in which you start on an aircraft carrier, with 4 pelicans loaded with marines. once you get on one, they take off and land on the island, and they stay there, so you can take one back for more marines and guns from the armory. another mod is all wraiths in assault on the control room and two betrayals aare SCARABS. the first one you meet is destroyed with an airstrikem the rest are done by you. also, for balancing issues, the scarabs lasers would not home in on targets.
anyways, i need tags for all the single player levels, and some peopl who know how to make single player levels.

yeah a project like this would lag horribly and likely crash the game often too.