You should have seen the box this came in!!!!!
Actually this is a scale model of the Yamato on display at a Kure Yamato naval museum in Japan. I stumbled across these images while searching for something completely different.
At 1/10 scale, that makes the model roughly 86feet long and 12 feet wide at the beam.
Nearby are much smaller models of the carrier Akagi and battleship Nagato.
I am not sure but I believe this is the model used in the 2005 Japanese film production of "Otoko-tachi no Yamato
" (roughly "Men of the Yamato.") The film is available on DVD.
Edit: You can see even more images on this page: http://album.nikon-image.com/nk/NK_Imag ... 7313&pos=1