You can actually get Revans Mask in the Cartel shop in the Fleet, both Republic and Empire, but what annoys me on that is that it requires Champion lvl reputation and like 10 certificates, which you can only get through luck and chance in the enforcers packs and cant buy or sell them to other players. Not that I don't see anything wrong with that, its reasonable since Revan's a beast lol, but annoying that I have to jump so many hurdles to get it lol.
As for the mask under hood, I too had these issues. Its the same for any head piece actually. I assume its probably a bug that needs fixing, which is probably one of the things they are working on with the server maintenance.....I hope...