basically, all you need to do is get a gold medal on battle of hoth. So for N64, the passcode for all levels is Deaddack, go and get a gold medal on hoth, and u have all the ships.
For PC you can type in the oompawampa code, and get a gold medal on hoth...OR you could be REALLY cheap, and go to Luka's site
and go to the downloads page, and dload RogueEdit, and give yourself a gold medal on hoth.
A wise moff controls through a fear of force, rather than actual force itself.