The "HT" RTR boat range also includes a couple of battleships, both about 1/350 scale - one is the Bismarck, the other is sometimes described as a Yamato, but is actually a "freelance" design based loosely on the US Iowa class.
If you want a R/C 1/350 battleship, the HT Bismarck is probably the way to go, Howes are currently selling these very cheaply. If you want a more detailed and accurate model, you could combine the hull/deck from this with the superstructure, turrets and detail parts from a 1/350 plastic Bismarck kit.
I'd definitely recommend installing a lower-voltage battery pack in it, though, unless you want your battleship to run like a speedboat (see this link -
http://de.youtube.com/watch?v=-zHD2UdeHMI)