Oh and it is much easier to make sure the inside fits the outside.
I do 3D modeling. You don't tend to build the inside details for a version of the ship that will only show the outside as those polygons can make for higher render times.
You build up multiple models, like a low poly distant shot version, a high poly close up version, etc... and build the interior in another layout. And even then might only build what is needed for the upcoming shot(s), like "generic hallway A", or the "Breakroom setup C". That's how you end up with oddities like "If A existed in episode 503, then why didn't they use it back in episode 106 to fix the same/similar issue"...
Who said anything about using the interior inside the model you are using for outside renders? I said it is easier make sure everything fits. You would not actually render it that way.