For everyone's amusemant: http://cloud.steampowered.com/ugc/540675791390576189/09A7F8287020CCE78B900967CC5936F9E458A476/
and http://cloud.steampowered.com/ugc/540675791390573893/3047D3DB90C6729E0EEFFABFC0851903946AA46C/

I was following a tutorial on importing weapons from Oblivion, except I switched things up and tried importing a helmet instead.

Obviously there is something wrong. Looking for someone to enlighten me on what I'm missing here.

The helm, if anyone is curious, is McMuffin's Colovian Helmet.

It's improperly rigged. If you explain the process you used then it'd be easier to see where it went wrong.

Well, I just followed http://tesalliance.org/forums/index.php?/topic/4634-3d-craftworks-importing-weapons-into-skyrim/ on tesalliance on how to import weapons. I was more interested in importing helmets though, so I tried importing a Colovian helm, just to see how far I could get.

Given it was a weapons tutorial, I wasn't at all disappointed (well, maybe a little bit) with how far I was able to go.

I've never done rigging myself. Though I'd be happy to follow a tutorial on how. I also wonder if there's a cheap little work around, like by copying the rigging from an existing helm and replacing the Colovian helm's original rigging entirely. But again, I've never done it before so I don't know how much rigging entails.

Just bumping this so it doesn't fall too far into Oblivion.

If you exported the Colovian helm as an .obj then imported it into a Skyrim helmet mesh, I see no reason why it shouldn't work like the weapon tutorial.
Compare your new mesh to an existing helmet mesh, see if it's missing anything, in particular in the BSDismemberSkinInstance node.
The only other thing I can think of is if it needs a related tri or egm file.

Helmets in Skyrim don't use any tri or egm files. And they have skinned data so any weapon tutorials or exporting through obj format do not apply here - it won't work well as you can see. Though any armour importing/exporting tutorials should be more helpful. And skinning can only be done in Max or Blender, and can't be created in NifSkope. Copy skinned data from original Oblivion's mesh in NifSkope is also not a really viable option, as names of the bones and their translations are different.