I love Halo, but porting games DOES NOT ALWAYS WORK. Especially in the case of Halo. Only items/Weapons that have something more than a Generic Purpose would be of any worthwhile.
I.e. Portal Gun/Gravity Gun.
They work because they are original, there's not 10 Million of them in existance, making it easier to turn into a Mod.
In-Short: GO PLAY HALO.