The stop motion side of things is one of the reasons I've put together so many custom marines, the issue is time to do it (it takes a LOOOONG time just to do a short clip) and creating a "set" for them.
I did this 6 years ago, the youtube stabilizer made it more shaky than it originally was (original has no gun sounds, just music). It's 17 seconds but it took me 3 or 4 hours to get all the frames, some of which are blurry and I should have re-shot.
I have an audio filme on my old laptop that I intended to use for an Aliens stop motion, I had spliced audio from the Halo cut scene where Johnson/Keye's discover the flood and AVP2010.