A little question to you Total_Warrior:
how much experience do you have in the world editor?
are you a beginner gui user, advanced gui user, expert gui user or a
beginner jass user, advanced jass user, expert jass user or a
beginner vjass user, advanced vjass etc...
have you ever worked with programs like RTC?
tell us how good you are in editing with the world editor before starting this huge and *nearly* impossible project
because first of all: this is going to be really really hard to make and you will definitly need a team of good developers if you dont want to make a life-time project out of this on your own.
then second of all: you need to make people enthousiastic in your game so they might want to join you in your project.
then third: if you are planning to make a game this big I should make a deadline if I where you... (and don't make the time that you have to spend small, if you think this project is way above your skills then don't start it because you will probably not learn much of it while you sit back and watch other people program the game for you...)
Tell us something more about yourself and about how you are planning to start this project...
You now know that it is possible but now you need to have a commitment for this...