I could do it, I have quite a bit of experience though my only real successes have been about 4 rps in the past, plus a few others I joined.  The biggest problem with DBZ roleplays is well plot, and a stupid amount of training sessions.  DBZ as a series is mostly about trying to power up enough to take out the next big baddie which gets stale really fast.  Admittedly I liked the original dragonball with its odd characters and cooky plotlines better than DBZ which tended to feel stale by comparison.  I even liked GT more than DBZ at times because it brought back some of the craziness that the original Dragonball had.  Course DBZ had the epic fights which is what go the series famous overseas in the first place.  Anyway though I'm off topic.

Constructing a Dragon Ball roleplay in a way that limits the 'training itch' and pure power plays is the trick.  Of course any dragon ball roleplay is going to have those training times but even those events should try to have some character progression as well aside from power ups.  In any event figuring out a good storyline to provide a healthy role play environment is a bit of a trick.