Marti Michell's book: Machine Quilting in Sections. It highly recommend it. She uses regular quilting and then joins the sections of the quilt and continues.
On the other hand, I have quilted a rather large bed quilt on my Viking, which has an almost 7" harp. I just rolled up either side and worked from the center out. I had small tables and my ironing board surrounding my machine to prevent the quilt dragging. It worked. would do it that way again ... NO WAY!!
That's why I got my HQ16.
ali