Progress report: I am using the perle cotton, and it looks great! I am working with a quilting hoop instead of a frame, and it is a little awkward, but I will probably get used to it. Right now my only problem is how difficult it is to put the thread through when going through a seam. I will try a small pliers on my next round.
I am using the Hobbs wool batt, and it is wonderful. I pre-soaked it to avoid the crinkled look. It survived that process and dried quickly on the tile floor. It was not difficult to sandwich the quilt.