Ok so we know that one shot from Pluton = island is shrek'd.
Also since Franky had the blueprints for that bad boy, what do you think are the chances that some of that sweet tech was used to build the Thousand Sunny? (i.e. Coup de burst /Gaon Cannon)
And if you think I could be even remotely up to something, how many times bigger would the actual same cannon from Pluton would have to be to actually destroy a random island?