I've seen several unbacked Eastern Red Cedar self bows in person and on this site. There used to be a Gentleman from Goodletsville, Tenn that made quite a few 90#+ Warbows with it, unbacked. JMO, but if you are going to back it with drywall tape you might as well order a kit from Bingham and use real glass. Rawhide, sinew, or bamboo work perfectly well.