It was laid down before 1946! It must be legal to build! Please tell me it's legal to build! http://www.youtube.com/watch?v=xCJtBVqc0Ok On second thought, maybe not... still got a few bugs to iron out. Here's the full clip in real-time: http://www.youtube.com/watch?v=xiAtH3Y3Q5s
If I remember my anime history, the space battleship was built inside, but not from, the remains of the wrecked IJN Yamato, to conceal it from prying eyes. That being the case, the keel of the spaceship was laid a LONG time after 1946. Sorry, no wave-motion cannon for you.
I think this Yamato was the guy who converted the monstrous 34-inch Polar Lights U.S.S. Enterprise refit from Star Trek: The Motion Picture (and Star Trek II-VI) into an RC submarine. Either way, still awesome. But hey, look at it this way Kotori: if you haven't already done a Yamato and don't want to spend the money converting it into a warship, take a Yamato hull and build it up like the Space Battleship version. Gotta admit, that would be pretty epic.