Vektor, something I've been thinking about since I saw the Big Guns ...
I wonder how they would look concealed behind a "garage door"?
That is, you put some kind of roll-back hatchway over them. This would provide for some dramatic effect, since you'd "roll out the guns" by rolling back the garage door.
It would also allow for some additional detail around the guns, since the implication is that the "garage door" exists so that you can pressurize the area around the guns for maintenance. So you could get hatchways near the big guns, warning signage, perhaps a rotating red light near the hatchways.
Just a thought, mind you. This is fantastic work, as always.