I am trying to make a mod for new vegas to add a bunch of new weapons, armour and npcs but for some reason any headgear I try to add sits at a 90 degree angle. I tried Updating FaceGen model availability but it did not help at all. Anybody have any alternative fixes for this?

Open the mod with FNVEdit, browse on your model, check the FaceGen Model Flag, Edit, remove the 0000000 and set 1, you will see "Head" appearing. I think it's enough.

(Avoid to click Update Facegen Model Avaiability on NV)

Thanks a bunch, that fixed it, thankfully Update Facegen Model doesnt seem to have broken anything.