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Thanks for the real world XP on the dock float. I did some research using a 2.5 pound shell at around 250 feet per second exit velocity and I'm coming up with 1600 ft/lbs of impulse. Which is...

Yes. Present finale plan is 8 3" quick fused for almost simultaneous launch. The racks will be build sturdy, and the cakes will glued on their own boards before going on the platform.

and I do...

Overall size of it will be 12'x12'

I tend to over engineer things I build, but want to be sure if i step up in size to 6" shells or so in the future I dont need to rebuild the whole thing.
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Going to be launching on the water from a floating platform built with 55 gal plastic barrels as floatation. The surface will be 2x6 or 2x8 boards with cross bars underneath every 16 or 24 inches...