Thanks, guys!
Beadman - I used one layer of skins, overlapped slightly. I've only had one Tfish-backed bow break - an ERC that was really pushing the limits. It broke where two skins met. I think two layers overlapped to cover the seams would hold just about anything together. These critters have some really tough skin. I've seen scars on them from Cudas or Sharks that couldn't cut through their hide.