yes, the cost in both materials and time is a large part of my stress. I would not have been able to sign up for this class if my DH job status had changed just a couple of weeks earlier, so I am trying to consider it serendipity. My DH says that worrying about the class is a de-stressing technique to keep me from worrying about the future, and I think he is right.
I have enough scraps in other quality fabrics to make a scrap and white quilt... so that is my backup if the shibori doesn't work.
I did just realize that I have a newish high quality king sized white sheet I could dye- so I could eliminate the muslin altogether.
So my big concern will become preventing shadowing. With JN patterns, can I press my seams open? I just look at all those points meeting and doubt it.