Tor-Tis
I guess celluloid is already tried and tested but this material seems interesting to me.
It sounds like it would be very easy to make a pair of good looking scales out of this, just warm it up under the tap, cut out the scale shape and then hand sand and polish, only downside that I can think of is that you'd have to avoid getting the scales too hot but that wouldn't be a problem for me.
Attachment 159027