I would also caution you about excess bulk. Normally, binding strips are joined on the diagonal so you don't have to deal with a seam on the front and the back. From your questions, it sounds like you are a new-ish quilter. (BTW, you quilt the quilt, trim, then add the binding). Binding is a skill lots of folks find challenging. Dealing with all those additional seams is going to add to the challenge. I would consider using long lengths of one fabric, and add a square here and there, making sure that your joining seams don't land on a corner.