Hey, to defend my geek cred, I never said that the Hoth fortress wasn't awesome. Awesome, however, is not the same as practical. I'm pretty sure that making the place warm enough for humans to live in, lubricant not to freeze in X-wings, etc. would leave a huge, detectable heat signature. Also, building your fortress of material that's prone to cave-ins, etc., especially when your military equipment presumably isn't terribly easy to replace (it's not like they can waltz into the Coruscant shipyards and order up a new fleet of planes stat) doesn't seem like a very good idea, at least to me.