For the record, I did this conversion years before the Will Smith movie. :-)
Starshina Brondski leads a convict platoon into hopeless, suicidal mission after another.
In repairing his equipment, he took the arm from a destroyed Angel-Eater, and mounted it on his own shock armor.
In game terms, this was a single shock-armor trooper, with the command/leadership points of a starshina, and a single fire action to use either cannon. I don't remember the point totals (I wasn't the math nerd), but he didn't break the game as I recall.
The image is a link to a large image.