The Millenial Falcon doesn't make a whole lot of sense, the V2-shaped rockets are aerodynamic shaped spaceships designed to get us into space and form follows function. We could have Traveller ships that look like V2 rockets of different sizes, but that would be boring and it would be hard to distinguish one from the other, but as most of them land, that would make the most sense.
A more popular design are the vertically landing airplanes, the Scout/Courier is one of those as is the Free Trader, the Far Trader, their engines are mounted in the rear, but they land vertically on their bellies even though their engines don't point in that direction, this can be justified by citing reactionless maneuver drive engines that don't need rocket nozzles but then it wouldn't make sense to put such engines in the rear of the spaceship but rather underneath so the ship can be balanced as the engine's thrust supports its weight above. People tend to think of spaceships as airplanes that fly through space, the 1950s had less of that, they had less of audiences with that expectation, they thought spaceships should look more like those model rockets they launched in their backyard. The early 1950s movies also tried more to depict zero-g while the later movies just didn't bother.
