I agree with 2·GJ. Each level should be playable with Lori.

On the story thing the following:
We've still got numerous submissions left. There's enough room for some plot deviation. We can control that quite easily. A bigger problem is the end of the plot. We must be very careful not to let the plot end suddenly in the final level. Every contributor wants to keep the plot line alive, so that their successor has enough room to expand the story. If this remains till the end of our list of contributors, the story will end very abruptly in the last (two) level(s). I think it is best that the group of contributors that are going to work on the end should discuss how they are going to end the episode. Just to make sure the storyline ends in a normal fashion.