I think the scale problem you'd run into is that if the scales are accurate, you'd either get a tiny portion of the ship with visible characters, or you'd get a ship with 'see that tan dot over there? no..over there over the intake?..;)'
What I've done is if I'm modelling a ship, I don't ordinarily worry about characters (unless it's a shuttle or something more 'yuman sized'..;), and if I'm using characters, I just model the visible part of the ship they're next to. If you're having a flyby, the 'actual' scale may not be that much of an issue, you can 'force' the mind to accept scale by using visual cues such as angle (looking up looks bigger, etc), distance from the viewpoint, putting something of 'known' size in a visible position, etc.
Since you can scale a lot of things in Poser (well, sometimes not all that easily, I wind up typing in values rather than spin, spin, spin..;) you can do what you like. They're all great models, keep 'em coming.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)