DayBreaker Neat, but they can use some inprovement.
The second one has to much crew.
The third one needs more spread our ftl's and try to place the a power storage near the far left and far right engine rooms, and move the top left adn top right reactor a bit more to a save location and place a power storage by those shields that ar in the top leaft and top right.
And the fortht one, make use of medium and large reactors without overstriding the suggested power quantity, 4 sensor arrays arent neccesairy 1 is enough (2 if you want to keep it symmetrical), engine rooms in the middle are useless, spread the crew a bit more out, and some other things if you find them to far away from the nearest power source just place a power storage.
But the theme overall is nice. :3