That\'s not a shotgun with rockets. Just, Freud was right.
However, there are sound gameplay reasons to build a giant flying metal ...cigar. Power and engines both work best if laid out in long 1x1xn colums, and a bundle of little sticks makes one big stick. This shape also gives you a large number of blocks between prow and core for improved survivability. Cubes are also good, but for some reason very few people build cubes.