Anyway, the main spaceship, The Gohten, follows that particular Japanese trend of interstellar vehicles that resemble Earthly naval vessels, with the addition of an Atragon-esque drill bit in the bow. I recently stumbled across this cool promotional poster with cutaway diagram of the distinctive spaceship. Enjoy.
If you haven't seen the movie, I'd suggest checking it out. It's not quite as much giddy, goofy fun as Toei's Message From Space, but it's an enjoyable space adventure film. Here are a few of the theatrical posters and other promo art: