Modifications must not only change the vehicle, they must improve it. A good car needs a theme, a constant design direction for the whole car. It can be dictated by year, technology or graphic style but the whole car must flow together mechanically and esthetically. There are no rules that can't be stretched, bent, pushed and pulled. The trick is that it must be well broken. Pushing the rules has resulted in some of the greatest hot rods of all time (and some pretty marginal ones, as well.) Stretch the rules gently -- a little movement in a new direction goes a long way. Do remember that you are building the car for you. It is most important that YOU like the car. If others appreciate it as well, that's good too. Remember to have fun. The real purpose of modifying a car is to have fun constructing it and driving it. It is not a shrine, car port queen, or museum piece. It is a rolling piece of self-expression and craft to incorporate into your life.