These things are extremely simple to setup, and I will definitely buy another one for another more serious project in the near future
The cannon itself is pretty simple:
1-1/2" by about 8" chamber
1-1/2" by about 14" barrel
3/4" sprinkler valve
160 psi operating pressure

Right now I've got my valve running at 12v because that's what the RC unit is rated to, is this hurting performance much?