We used hinge with no rivets on my ES and have had no problems with it.  I
have the hinges along the sides and vertically on the lower cowl at the
firewall.  We drilled holes in the hinge material, bonded them to the cowl
with hysol and a little flox, then put 2 BID over them.  They aren't going
anywhere!
   Skip Slater
   B540ES