"Outer Diam" is the inner diameter of your chamber tube.
"Inner Diam" is the outer diameter of your barrel for a coaxial cannon.
If your design is not a coaxial, the "Inner Diam" should be zero.
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Just as a matter of opinion: cam locks all day every day. In a mounted configuration like yours screw breech works well enough, but any usage where the barrel is free to move in any other axis than forward/backwards (and rotating) they become very annoying.
You could also spring-load them or even just add a larger handle to the valve as well. I think with a few bucks worth of tubing/fittings, and a small 1/4" ball valve, you could really make those three sprinkler valves work a lot better as well though, all depends on what you want to do.
i have found the plans and will upload them shortly I have been busy trying not to lose everything but I wanted to post an update so your not left hanging ill probably take pics of them and upload them that way it will be the easy way t save etc. I also have a few others I may upload like the PAC 6 ...