I am currently porting the Doom3 SMG/Machinegun with its animations and sounds to CSS. Yes you heard right, I learnt how to port doom3 animations. -Loads of problems occured, but up to now I managed to fix them all. The world model is also already finished, still there are many things left to do, like maing a buy menu pic, fix the reflections, replacing the Doom3 hands with CSS ones and finally online testing before the release.
I also though about including a reorigin, the current ones you can see in the screens are the exact Doom3 ones but I'm personally not too fond of them as I like to see more of the weapon ingame.