What's the delay between shots? Just a suggestion, but it would be awesome if it shot a single shell each time and alternated between the two guns with a delay between shots of about half a second.
Coincidently, it's already doing just that. I'm not sure yet how we'll be handling the projectile / explosion / damage stuff. However, it does alternate between barrels when firing and the delay is currently set to 500ms.
It's pretty cool to see in action, and I can't wait for when we get it finished.