If you go to the following link you can see how I did the backs. They turned out much better than I expected, and not very hard to do.
http://picasaweb.google.com/rbakedq/Khorn60thAnniversaryStyleBacks#
Parts list: 8' 2x10, 4x8x3/4" mfd, eye bolts, toggle bolts, screws, weatherstip, felt and paint
Rich