In the top left of the viewport in the VAB are two circular buttons. These can be used to create symmetrically spaced parts around your ship. There is a setting for 2,3,4,6, and 8 symmetry on the left button and the right button is for angle snap. By either left-clicking on the capsule or holding shift while left-clicking anywhere on the rocket, you can grab the rocket and move it up or down using the scroll wheel on your mouse. While it's possible to edit .craft files to manually build a ship, it's not recommended. Try visiting the Spacecraft Exchange for .craft files you can download and load up in the game. Happy Launching! Arrr! Capt'n Skunky KSP Community Manager