Yeah, I'm excited to try sinew backing again.  I have only done one successful sinewed bow, a kid's bow.  The one juniper/sinew bow I did exploded on the tree.  But I have a bunch of nice juniper.  My plan is to get a couple bows roughed out this winter, then sinew them in the spring once it warms up a bit.  I also have a couple of decent maple pieces that I might try sinewing.  Stay tuned...