NICE! I love it. The side disks are nice and have a good texture there.
As for scaling. GalCiv3 uses a sort of dynamic scale, and on the galaxy map, a ship's size is always the same as its class. Length wise.
So to get around that, you can place very small tube parts (they are in terran, black, very plain) and project them out from the front and back of the ship. They are effectively invisible in game, but will extend the scale so you can control your sizing better.
I like my ships to look relatively accurate to each other, I don't want my tiny probe to be half a medium destroyer. I get obsessive, regardless of scale, I try to ensure that turrets and fighters on all models look the same size... with varying success and failure.
Hope that helps!