This was one idea that came up in our brainstorming, but we were unable to find sufficient details that it was a promising approach and not just a theory. Got any links to videos or verification for concrete design details?
At some point, we may want to launch crabs which will require a 2.5" or 3" barrel in the cannon approach, so a big slingshot may be preferable if can be confirmed to actually work and reach 150 yards with baits of this size and weight.