Surf cannon
 

Searching youtube and found this pretty cool!

Surf Cannon - YouTube

cool, you could probabaly use a potato gun to do something similar

But the fish are in the rocks... (With that you could get to the Vineyard/Cutty/Block without paying the ferry fee!!!!)

Why not just cast it?

Easier than yak casting the only way I would buy one is if I could have it mounted in the bed of my truck with multiple barrels. That you could aim and adjust the trajectory with hydraulics.
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trailer size for the canal, hang on the access road and punch it

5th Wheel Clambrella SAM launcher?
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Fun for the whole family
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Send a child skishin!!

Distance capability for those contraptions is wildly exaggerated.

Logistics are a pain . . . You need to keep the bait/sinker 'cartridge' frozen solid so you either need a freezer or dry ice for fishing a tide.

Bait choices are limited to what you put up earlier in the freezer . . . How many do you bring and waste if they thaw out even a little bit?

For what they cost you could buy a high performance distance fishing set up and exceed what that Rube Goldberg can do (with practice of course).