Basically what I did was I took a Republic Fighter Tank set, and edited it. This is a side view of the tank.
This is inside the cockpit. As you can see, it is expanded, and I took out the pop up seat.
The roof could fold up, so you can actually put the minifigures in the tank easily.
I changed the turret on the top. Since there's no pop up seat, I covered the hole with a rectangle lego piece.
The weapons include: fold out missle launchers, three cannons(one on the bottom, and one on each side), and two foldback cannons near the fromt.