Probably the most tantalizing of unmade films for fans of Godzilla, is this particular movie. Most likely because this is the one proposed project that got as far as getting us a production statue of the would-be villain Bagan (to which his appearance here is based off of). That, and the fact that Bagan was to have been involved with the early drafts of "The Return of Godzilla" as well as the main opponent to a Mothra feature (before the whole "Rebirth of Mothra" series was conceived).
I see many clamoring for Bagan to still make it to film, and I still havent reached an understanding of exactly why. But nevertheless it was fun to draw him facing off with G, in what may have become a feature before "vs. Destoroyah" came to be.
From what we know, the battleship Gotengo would have been the JSDF's advanced battle weapon to handle the kaiju combat. I guess Japan's budget was low after the high-tech Mechagodzilla and it's lesser cousin M.O.E.G.E.R.A.
One things for sure, I wager that Bagan would be a handful for Godzilla and the Gotengo, and that's what I wanted to depict!