Thanks so much for all of the suggestions! So one thing that I'm trying to do is have kids individually, or in groups if I have to, actually focus on making just the terrain first, without focusing on building on it yet. This is why I was thinking World Painter would work. I could have it in the lab on the computers... the kids make their section of the world, save as a world file, and then I maybe use World Painter to combine all of the terrains. Then whens I in theory have that done, they can then go in and build.
I'm having trouble envisioning using MCEdit for this sort of approach. Does this make sense? We only have one server here at my district at the moment and I want to try and keep from having 25 kids all in the same world at the same time hackin things up.
Have any of you used World Painter?
Thanks so Much!