all my holes are a little off, but im getin better at it. i actually drill my holes before painting the bodies. i have my body posts cut really short with extenders. so i take the extenders off and put the body on the ground to make sure the body sits level. and if i raise one end,i also raise the other side so that the body always stays level. if your body is not level when u mark the holes, the body will move forward or backward when u mount it. ie. if u mark and drill the holes with the rear end tilted up and the tires in the center, when u mount the body and make it level, the tires will end up in the rear of the tire wells because the way the body moves. and vise versa if u drill the front tilted up. hope that helps bro. also measure a buncha times then drill once lol.