If your seriously going to make a JJ2 MMORPG, then first get Realm Crafter. ( Google it ) It will be out soon but is a fully ready to go mmorpg maker with graphics support, open source code, script language guide ( uses Blitz Program Language ), the works. Then, get a good modeling program like 3Ds Max or Alias Maya 6.5. I purchased Alias Maya 6.5 Unlimited ( 4000$ ) and Im already able to make a Human with RABBIT EARS.

Now, since Epic won't let go of the name to JazzJackrabbit, it will need to be a FREE FAN GAME, so no profit can come from making a 3D imitation of JJ2 in any gameplay form. I know, your thinking why bother?

Other then all of the complications, this sounds like a good idea... but Maple Story is sort of.. weak. But hey that's just my opinion.