Awesome! I hope you build that sometime!
It looks like you're using some kind of motor to rotate the barrel carriage. Any chance of turning that into a pneumatic escapement mechanism of some kind? It would be some awesome to hear that thing run soelly on pneumatics!
Also, it would be awesome if you put enough reservoir tank on this machine to fire off a full battery of T-shirts before recharge...
one five gallon tank should be enough.
By the way... when you build this thing... you should get Mountain Dew graphics for all of the barrels to make them look like cans of mountain dew!
-q