The freighter needs more mesh details, and more/much bigger engines. Prolly just take the lid off the cargo hold area entirely.
As for the constructor, make that underside hangar bigger, more open, and take the top off of it so the dock is more easily accessible. So that means the top front control tower needs to be a bit forward of the underside tower, and the bridge thing (rear top tower) goes back to above the engine array. And I know it's a utility ship, but give it some guns. Maybe only a simple point-defense array, but something to defend itself with.