Well to answer all your questions:

Flamethrower will be in the sword room.

Hud will most likely be H3, I haven't decided yet.

overshield/camo will probably just be the same

There will be Halo 3 stationary turrets in the classic version. There will be a Halo 3 version of the map as well (most likely) and that may or may not include a detachable turret, CAD is going to work on a test later, we'll see how it goes.

More awesome texture by Con: