Hm. Of course I can do it. The way I see it, I have two options. Option A includes a kind of revolving mechanism, switching and trading out beams via certain mechanisms. This would make the cannon heavier, but would carry more ammunition. Option B would be a kind of "clip" system. I could make slots to hold a special clip/battery of the power, but each clip would be small and easy to expend easily. The pro of this is that you can carry more ammo on your person, and it still retains its original weight without encumbering your drastically. Which would you prefer?