I made one like Blackhawk described for hunting season last fall.  The limbs were about 2" wide at the fades and tapered to about 3/4" at the 2/3 point.  I left the limb a little thicker working into the 'outer fade', for lack of what else to call it, and made the outer 1/3 of the limb about 1/2" wide by 5/8" thick.  It's hickory, around 65" N-N and pulled 48# at 28".  It's probably the fastest bow I've ever knocked out, though I'm not sure how long it will live with the 20" working limbs.  I finished it the day before the season opened, so I was too busy shooting it in to take any pictures.  My measurements are approximate since I don't have the bow here in Afghanistan and I'm working from memory.  I go on R&R in a couple weeks, and will take some pictures then.  I suspect, if it fails, it will be at the transition from working to outer limb, since I think I should have left it a little thicker there.   While it lasts, its a snappy little bow, and flings my poplar hunting arrows pretty hard at the target.  I'd like to see what it does with a lighter arrow though.