I've been rotating the parts, and additionally, I've been using the symmetry and snap-to-angle buttons, but the parts just won't line up correctly. For example, in the video I was attempting to follow along with, he has you start by laying some fuel tanks in a line, and then adding more along the side. When I attempt to get the tanks on the side into place, they keep jumping along, and no matter how I move my mouse, I cannot get them into the same place that he does, nor can I get them to snap on "close enough". They typically refuse to snap on straight, preferring angles.