Very good so far...
rember the more real you want it to look... the more details you put into it.

Before I continue, I have to say that I am by no means even close to the talent you have in making of these sets... actually I suck big time. But I do know what looks good to me and what I would want to do if I knew how...

...so maybe put some "clutter" onto it... like scratch paint on walls, some pipes or what nots (whatever there are in real freighters) stuff to the walls that make it look bulky and non-symmetrical instead of sleek "box"-like walls... you know, wires, antennas, handles, plating etc...

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"Only Idiots Quote Themselves!" - Me