Explosive "barrel" and turret design.

For my barrel, I am thinking I will do a wooden ammo crate or some sorts to fit with our theme of an "Mexizona" military base.

I was thinking of something like these:

 

For my turret, i will be adapting my design for my level's giant set piece gun to make a smaller, visually similar model that I could use towards the final model of the other artillery piece.

Here is what I was thinking of that I modeled quickly.