This is not fully completed and some cannons may not work properly but you can adjust that by messing with the redstone delays/repeaters.

This one currently featuresa total of 7 cannons on 2 stories, this is not completed and the number of cannons will change as this gets completed.

Here is the link to the 4 cannon one that is completed: www.planetminecraft.com/project/cannon-launcher-626/

Be sure to comment!

THIS EDITION OF THE CANNON WILL NOT BE UPDATED
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[NEW]:
HERE IS THE COMPLETE 8 CANNON EDITION: www.planetminecraft.com/project/cannon-launcher-626-8-cannon-edition/
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IMPROPER REFILLING OF TNT'S MAY CAUSE IT TO BLOW EVERYTHING AROUND IT.

Additional Notes

The Schematic file really isn't a schematic file, it is the save world.

This is currently in Creative mode, so if you can convert it to survival and message me it would be greatly appreciated.

I work on this every day so expect it to be finished by the next month with full 16 cannons

NEW: www.planetminecraft.com/project/cannon-launcher-626-8-cannon-edition/