Well, on weekends, it should be possible to get something organized, If we set the time at a noon-1pm Eastern start, then it is early evening in europe. As long as people can manage to set aside 2-3 hours on saturday/sunday then I'm sure several turns could be played over the weekends.
But you're right, there will most assuridly be some scheduling problems. but using the afternoon/evening type schedule much of the fuss can be avoided.
If no one can find or manage the weekend-game idea, then we can always revert to regular PBW but that would defeat the purpose.
Anyway, it's just an idea at this stage, there still needs more interest before it gets off the ground.
Cheers!