Carbon, I just had a little idea for you. You've been having trouble finding a workable metal for your triggers. If you could find a small peice of "unworkable" metal, say steel or something, you could heat it up in the middle with a blowtorch and then bend it. Not exactly simple or easy, but it just occured to me as a possibility.
With a bit of work, you could modify the SNAP-S with a hinge so that you could load it like a break action shotgun. That would make reloading a lot quicker, more efficient, and kinda unique.