The dimensions of the Musashi are:
• Total Length (from the front end of Shinagawa to the rear end of Takao, or from the front end of Asakusa to the rear end of Oume) - 7356 m
• Width (from starboard side of one ship to the port side of the ship on the opposite side) - 2076 m
• Height (from beam to lowest point in the hull) - 863 m
Compare this to the longest ships in modern times:
Imagine this, the longest passenger ship, the Queen Mary 2, is only ~5% the length of the Musashi!