I agree, starting with the best material possible will help. If you're wanting shimpaku and/or JBP check with John Kirby, among others to be sure. He has some good material with a good future, particularly JBP and a few itoigawa, if I'm not mistaken. With the proper work, wiring, trimming, thinning, feeding, fertilizing, watering, knowledge, etc. I don't think it's tooooo ambitious. Certainly a lot of the right work to be done to reach your goal.