Your Z looks great as is. I wouldn't touch a thing. Except maybe get the Mine's spoiler add on as the finishing touch.
You have it in your mind in how you want it to be so go with it. But I would be hesitant to add the pinstripe to the wheels since the spokes reach all the way to the tip of the tiny lip. I am just not sure how it will look once finished with the pinstripe going over a raised area all the way around the wheel. It may come out looking great. In for pics.