I don't have HL2 so I don't know how they look like.
To get grip on the file I took the *.cad ext from Breezer, that's the one qmle likes.
So to shake it up it needed a new skin which I took the Q2 gunner.
As there are some poly's missing it hangs a bit queer for its such a big gun.
http://members.home.nl/gimli/heavi.gif