This quilt looks great, and is pretty much what I want to do, with a sewn footbox and sewn to my knees. I'll go visit my mom, who does decorative quilts, and let her handle the tricky parts.
My question is, what does the silk do to washability? I have a synthetic Lafuma bag that is holding up pretty well, with/despite being put in the front-load washing machine on "hand wash" cycle a few times.
BTW, the Lafuma has a squarish (trapezoidal) footbox that I really like. It's 7" across the bottom, 9" across the top, and 9.5" high. It works fine for my size 8.5's.