I think we should do all states. Even California.
We don't have to do them all at once. And for the biggest states we can have a list of those who volunteer to draw proposed maps for them. Obviously that won't include everyone of course.
We can get to those, eventually, if this still has enough steam that long. But I think it’s only sensible to start with states of manageable size.
To the point about size, I think the two commissions thing will be annoying for people in both to keep track of. Feels better to me that just a certain mark (majority? 60%?) of each of the three blocs should be required, allowing them to vary in size.
