I have a question about the size. Assuming your king sized bed is 78 inches wide, that would give you a 26 inch drop on each side. That seems kind of much. Also, with such a huge quilt, you will end up with A LOT dragging on the floor at the corners. You might think about angling those corners a whole pile more. Try laying a blanket on part of your bed, with the projected drop and see what you think. BTW ambitious project but those are the most fun.