A friend is asking me to make a t shirt quilt for her. I know she has dozen of shirts. I don't want to go crazy at any cost! So, for you who have made them, what would you say would be the max number of shirts to incorporate? Would you put them on the front and back? Do you sash round them with quilter's cotton? I know you interface behind the shirts, do you use woven, knit or non- woven interfacing? Is it hard to quilt them? What kind of quilt pattern do you use?

Before I get in over my head, just thought I'd ask for advice.