An entire mod developed in a week. Is it possible? We just proved it was. An enjoyable mix of ego-shooters, fast-based CTF gameplay and team base attack/defend. The progress is available on the Facepunch thread.
A minigun model created by Samuelgames (Facepunch Username) which looks brilliant.
as you said: looks brilliant !
If the real deal doesn't count, this is one of the nicest chainguns I've seen.