I don't think I'd want to be one of two people responsible for putting the whole quilt together for the group. That's a lot of work, and I'm sure they don't yet realize how much of your time it would take. I'd have them do something like a placemat or mug rug first that they can hand or machine quilt. Giving them a list of supplies for them to get and bring to the first meeting is a fantastic idea. I had one lady come to a class I was teaching on making sweatshirt jackets with absolutely nothing!