Cobrafreak,
As tempting as it is to put a cannon on the bike; I am sure my buddy would not be game. However, I like the thought of using the ammo cans to house the ammo belt with dummy shells and the cannon; making the barrels from PVC would be cool.
Maybe I will do this setup on my own build in the future; possibly mounting the cannon & ammo can on a sidecar. Oh Yeah!