So--lets get crackin"!
My sentiments exactly.
In terms of the number of episodes, that of course depends on how long each one is. In the drafts I have done - I think there are 7 - I have just made it to the party's first arrival at the End of Time. And this is after removing much of the jailbreak stuff (though the Dragon Tank is still there). I'll make a separate thread about things I thought of while writing these drafts soon.
In terms of the voice acting, we of course have a number of people from our first go at things. Someone will very soon need to go through each to (1) decide if the voice is still a good match for the character and (2) contact the cast member to make sure he/she is still interested. Then we will probably have to audition for the remaining positions.
If I'm not mistaken, we had made a fair amount of progress on Episode I. What's left to do with that?