i think they should remain defenseless. i just hope the AI will be able to guard them.
Same here. They're not supposed to be mega battleships, and I like having to protect a valuable and dangerous asset like that with a fleet. OTOH, it could get a little tricky using it in Yor influence space, where they have a speed advantage and could sneak in an X-Wing... er, I mean tiny ship to take it out.
And ditto on the AI comment too. They won't be scary at all, if the AI can't protect them on the way to a target.
I'm also liking the idea that building one lowers your relations, but maybe that should only happen if you're the first in the galaxy to do it. Once other races have the tech and start building them, there shouldn't be a relations hit, or at least not as strong (IMO). And I guess it shouldn't apply to allies at all.
Or maybe the relations hit should only kick in when it's actually fired for the first time? That would give you some breathing room between researching, building, and deploying.