I worked on a GCA file for the Better Fantasy Armor rules. It's up on the Motoslave GCA Repository at this link.
I had to ditch the idea of using the Fluting and Hardened modifiers with Dragonbone, Dragonhide, and Dragonscale - GCA simply doesn't support having modifiers select modifiers in way that I liked. Instead, I created four modifiers for each type of dragon part: young dragon*, dragon*, elder dragon*, and ancient dragon*, with each increasing age category reducing the weight of the armor by another 10%.
There's probably some conflicts with Low-Tech in it and I may update the file to get rid of them. If anyone has other issues or suggestions for improvements, they can be emailed to me or added to the comments below.